EP1260319B1 - Dispositif à visser pour des embouts de tournevis - Google Patents

Dispositif à visser pour des embouts de tournevis Download PDF

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Publication number
EP1260319B1
EP1260319B1 EP02010975A EP02010975A EP1260319B1 EP 1260319 B1 EP1260319 B1 EP 1260319B1 EP 02010975 A EP02010975 A EP 02010975A EP 02010975 A EP02010975 A EP 02010975A EP 1260319 B1 EP1260319 B1 EP 1260319B1
Authority
EP
European Patent Office
Prior art keywords
bush
screwdriver
profile
permanent magnet
screw
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
EP02010975A
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German (de)
English (en)
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EP1260319A2 (fr
EP1260319A3 (fr
Inventor
Martin Holland-Letz
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.)
Felo Werkzeugfabrik Holland Letz GmbH
Original Assignee
Felo Werkzeugfabrik Holland Letz GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE10148943A external-priority patent/DE10148943B4/de
Application filed by Felo Werkzeugfabrik Holland Letz GmbH filed Critical Felo Werkzeugfabrik Holland Letz GmbH
Publication of EP1260319A2 publication Critical patent/EP1260319A2/fr
Publication of EP1260319A3 publication Critical patent/EP1260319A3/fr
Application granted granted Critical
Publication of EP1260319B1 publication Critical patent/EP1260319B1/fr
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
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B15/00—Screwdrivers
    • B25B15/001—Screwdrivers characterised by material or shape of the tool bit
    • 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
    • B25B23/0007—Connections or joints between tool parts
    • B25B23/0035—Connection means between socket or screwdriver bit and tool
    • 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
    • B25B23/02—Arrangements for handling screws or nuts
    • B25B23/08—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation
    • B25B23/12—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using magnetic means

Definitions

  • the invention relates to a screw device of the type specified in the preamble of claim 1.
  • a drive shaft which at one end in a receiving feed or a plug-in device of a power wrench, z.
  • a receiving sleeve As an electric screwdriver is used, provided at the other end with a receiving sleeve, are used interchangeably in the screwdriver bits (bits).
  • the drive shaft and the end portions of the bits usually hexagonal outer cross sections and the receiving sleeves corresponding inner profiles.
  • a rod-shaped or disk-shaped first permanent magnet is provided in a middle region of the receiving sleeve and an annular one on the front side of the receiving sleeve Profile tip of the insert pierced, second permanent magnet arranged.
  • the arrangement is such that the first permanent magnet holds the screwdriver insert securely and axially fixed in the receiving sleeve and that when inserting the profile tip in the inner profile of a screw head both permanent magnets jointly ensure that the end faces of the screw heads against the contact surface with a be pulled connected to the second permanent magnet, magnetically conductive disc.
  • the screw is pulled with great magnetic force against the magnetically conductive disk, but it comes to the full-surface investment of the profile tip of the screwdriver insert in the inner profile of the screw head only if the depth of the receiving opening in the receiving sleeve, the length of the screwdriver Use and the thickness of the magnetically conductive disc are tuned so that the length of the protruding from the disc profile tip corresponds exactly to the depth of the inner profile of the screw head.
  • screws with the same internal profile for example Philips Phillips (PH) 2, whose heads have different heights for different screw sizes, Correspondingly, the Phillips inner profile is different deep.
  • the internal profile of the screws due to manufacturing tolerances on different depths and widths, and also the length of the screwdriver inserts and the tip profiles are subject to certain manufacturing tolerances.
  • the axial position of the screwdriver bit to the contact surface of the disc is fixed, according to the length of the protruding profile tip. This has the consequence that in many cases, although the screw head rests against the end face of the magnetically conductive disc, but the tip profile is not over the entire surface in the inner profile of the screw. As a result, the tip profile is highly loaded especially at its edges, which leads to a relatively rapid wear of the profile and the whole screwdriver use must be replaced.
  • an outer sleeve coupled to a magnet may be moved and adjusted by axial displacement relative to the profile tip to ensure that the profile tip of the screwdriver fits ideally into the internal profile of the screw head.
  • Out DE-DM 1 784 695 is a holder for application tools of screwdrivers with spring-displaced guide sleeves known.
  • This holder is essentially designed so that the teachingcardende screw is guided with the screw head within the guide sleeve.
  • a ring magnet is embedded in the front side of the guide sleeve.
  • the compression spring pushes the guide sleeve so far forward until its shoulder rests against a ring which is arranged in the interior of the holder and connected to the intermediate piece. If a screw is placed with the screw head on the end face of the ring magnet, the screw is not centered to the profile tip of the screwdriver insert because this is opposite the end face of the ring magnet and the guide sleeve is pushed back with the ring magnet only when the end face of the guide sleeve the surface into which the screw is screwed. The screw must be inserted before starting the screwing by hand with the head in the guide sleeve and attached to the profile tip of the screwdriver insert.
  • EP 1 027 959 A2 is another screw with magnet known.
  • These Screwing device shows a screwdriver insert with a shaft of larger diameter and a reduced diameter tip on which a spacer sleeve is placed, which is provided on both ends with ring magnets.
  • the shaft goes over a step into the top.
  • the length of the spacer sleeve, together with the ring magnet is dimensioned so that it releases the profile of the screwdriver tip on such a length when it stops with the rear side of the step, that when screwed between the screw head and the front end of the spacer sleeve a gap (g) remains.
  • the spacer sleeve is held in a preselected axial position on the shaft of the tip.
  • this position should be such that on the one hand the head of the screw rests against the front side of the front ring magnet, on the other hand with the inner profile on the profile of the tip of the screwdriver bit.
  • Such a preselected position would correspond to the situation as described in the "Magnetic Restoring Surface Screwing Tool" of FIG DE 199 07 837 A1 is set.
  • An automatic compensation between tolerances in the inner profile and outer profile of the screwdriver tip is not possible.
  • the friction on the shaft caused by the rubber rings is greater than the attraction force of the ring magnets on the screw head. If, with the appropriate tolerance between the profile tip and the inner profile of the screw, both do not rest against the entire surface, then the screw can not be used by the force of the ring magnets against the profile tip until the complete abutment of the profiles.
  • US 3,707,894 describes a device in which concentric sleeves are placed and these are fixed by radially arranged screws in a preselected position to the tip of the screwdriver bit. Between the sleeves at least one sleeve-like magnet is arranged.
  • the screw head dips into a spherical recess on the end face of the inner sleeve and abuts against the surface of the molding.
  • the tip of the bit engages in the inner profile of the screw head.
  • the sleeves are fixed on the screwdriver bit in a preselected position, so that the profile of the tip of the screwdriver bit to the inner profile of the screw head assumes a fixed position, but this is an automatic compensation of tolerances is not possible.
  • This device thus essentially corresponds in function to the device according to FIG DE 199 07 837 A1 ,
  • the device is attached to a screwdriver insert.
  • the leading edges of the outer and the inner sleeve are in a plane, the magnetic material disposed therebetween is slightly set back from the edges.
  • the head surface of a screw should rest and be held by the magnetic field.
  • Inner sleeve, magnetic intermediate layer and outer sleeve form a solid unit.
  • the device is held by two spring rings which clamp around the shaft of the screwdriver insert or engage in a groove in the shaft.
  • the mode of action therefore essentially corresponds to the device according to FIG DE 199 07 837 A1 .
  • the required short length also results in a very short guide the device on the hex shank of the screwdriver insert through the remaining piece of the inner sleeve, especially since commercially available screwdriver inserts only in the chucking the hex shank, the profile tip but are turned off on a round cross-section.
  • Fig. 5 shows almost exactly the size ratios in the scale 1: 1.
  • a good guide is a prerequisite for the device is coaxial with the axis of the screwdriver bit and moves and a coaxial alignment of the attached screw is achieved.
  • the profile tip of the screwdriver against the head surface of the screw is back, only when the device is loaded axially when attaching the screw, the sleeves move with the screw so far that the profile tip comes with the inner profile of the screw for engagement.
  • the screwdriver insert often rotates when the screw is applied - turning is required in any case for finding the position of engagement of the profile tip in the inner profile in the screw head - the profile tip and / or inner profile in the screw head are damaged.
  • a disadvantage of the known devices is that the frontal components continue to rotate when the device touches with the adhesive on the front side screw on a surface and damaged by the further rotation of the frontal components becomes.
  • the task is to develop a screw that meets the following requirements and avoids the disadvantages of the devices: It should be normal, commercially available screwdriver inserts can be used immediately when attaching the screw to the device should by the action of the permanent magnet automatically both a full-surface Investment of the profile of the profile tip in the inner profile of the screw head can be achieved, even if the profiles have tolerances and the head heights are different, and it should be an abutment of the end face of the screw head on the front side of the device and thereby a strong adhesion of the screw to the profile tip of the screwdriver Be assured use, it should be achieved that the adhering to the device screw is aligned coaxially to the axis of the screwdriver bit, when sinking screw heads in a resilient surface, the outer sleeve with the Permanentma gneten against the profile tip of the screwdriver with the adhesive screw easily movable back, with the same surface screwing countersunk screws, the outer sleeve with the permanent magnet should not continue turning when the front
  • the invention has the advantage that a precise adjustment of the outer sleeve on the inner sleeve by means of a screw thread or radially arranged screws is not required. Due to the substantially free axial displacement of the outer sleeve on the inner sleeve and a corresponding arrangement and dimensioning of the various parts is rather achieved that the desired settings when approaching the screw heads to the front of the screwing revealed by itself.
  • a screw device comprises a receiving or inner sleeve 1 made of a non-ferromagnetic material with a hexagonal inner cross-section.
  • the back part is the one end of one with a corresponding hexagonal outer cross-section provided drive shaft 2, which is also fixed axially fixed in the inner sleeve 1.
  • the front part of the inner sleeve 1 serves to receive a screwdriver insert 3 made of a ferromagnetic material, the rear portion of which has a hexagon outer cross-section which fits into the inner sleeve 1 in a form-fitting manner in the direction of rotation and is provided with a profile tip 3a on its front side.
  • the insert 3 is axially z. B. secured with a snap ring 5 in the inner sleeve 1, which engages in corresponding annular grooves of both parts.
  • an outer sleeve 6 made of a non-ferromagnetic material is axially slidably guided axially provided on a the inner sleeve 1 axially superior front with an inserted into it, an opening 7a having, the inner sleeve 1 axially superior permanent magnet 7 (ring magnet) is.
  • the permanent magnet 7 is preferably inserted into the front end of the outer sleeve 6 in such a way that it protrudes slightly beyond the front side thereof with an end-side abutment surface 7b and is firmly connected to the outer sleeve 6 by gluing or otherwise.
  • the inner cross section of the opening 7a is preferably slightly smaller than the outer cross section of the inner sleeve. 1
  • the outer sleeve 6 is at a first embodiment preferably held by the force of the permanent magnet 7 in a preselected axial position corresponding to FIG. 1 or adjusted in this position. In this position, the opening 7a of the permanent magnet 7 is approximately in a central region of the profile tip 3a of the insert 3 and preferably arranged so that at the same time Permanent magnet 7 rests at the front end of the inner sleeve 1 and at the front end of the abutting spacer sleeve 8.
  • preselected position occupies - on the one hand the profile tip 3a, taking into account the different head heights provided for processing with the device screws, always up to the positive fit in the inner profile of the screw heads 4a can penetrate, on the other hand after reaching this prescribed immersion depth between end faces 4b of the screw heads 4a and the contact surface 7b each leaves a small air gap.
  • the arrangement according to the invention due to the preferably very smooth axial displacement of the outer sleeve 6 with the result that it is automatically transferred from the position of FIG. 1 immediately in the position of FIG. 2, as soon as the profile tip 3a in the inner profile of a screw head 4a entry. This location is preferred for magnetic reasons because the magnetic field tends to shorten the length of the field lines.
  • the attractive force of the permanent magnet 7 acts more strongly on the solid shank portion of the insert 3 bearing against the entire surface in the inner sleeve 1 than on the profiled tip 3a with the seated screw, thus one contractive force between the permanent magnet 7 and the rear portion of the insert 3 acts, has the consequence that the outer sleeve 6 with the permanent magnet 7 and the adhering screw head 4a until immersion and abutment of the profile tip 3a of the screwdriver bit 3 in the inner profile of the screw head 4a is used.
  • the attraction of the magnetic field continues to act strongly in the direction of the shaft portion, so that the screw 4 is held firmly on the profile tip 3a.
  • the axial mobility of the outer sleeve 6 in the opposite direction, d. H. axially away from the drive shaft 2, is arbitrary per se. However, it should be limited by the stop of the projection 6a to the rear end of the inner sleeve 1 so that the outer sleeve 6 can be returned from the most advanced position out only by magnetic force back into the preselected position of FIG. This is indicated in Fig. 2, according to which there is only a comparatively small axial distance between the back of the inner sleeve 1 and the projection 6a in the fully immersed position of the profile tip 3a and simultaneous investment of the end surface 4b on the contact surface 7b.
  • FIGS. 3 and 4 like parts are given the same reference numerals.
  • a difference to Fig. 1 and 2 is here only in that the insert 3 is not held by the snap ring 5, but by a rod-shaped or disc-shaped second permanent magnet 9 in the inner sleeve 1.
  • the permanent magnet 9 is z. B. arranged on the insert facing end face of the drive shaft 2, connected by gluing or otherwise with this and provided with an outer cross-section corresponding to the outer cross-section of the drive shaft 2.
  • the force of the second permanent magnet 9 is to be chosen so that, although the insert 3 is held securely in the inner sleeve 1, but this does not significantly impair the function described with reference to FIGS. 1 and 2 occurs.
  • FIGS. 5 and 6 in which in turn the same parts are provided with the same reference numerals as in FIGS. 1 and 2, a two-piece instead of a one-piece outer sleeve 10 is provided.
  • the outer sleeve 10 includes a permanent magnet 7 bearing front portion 10 a and a rear portion 10 b, which is provided with a radially inwardly projecting lug 10 c, which has a central, projected by the drive shaft 2 opening with an inner cross-section which is smaller than the outer cross section of Inner sleeve 1, ie, the projection 10c corresponds to the projection 6a in Fig. 1 to 4.
  • the front portion 10a and the rear portion 10b are also provided with certain for producing an axial connection locking means 11 and 12, 14.
  • the latching means 11 consists of a formed in the outer shell of the front portion 10a annular groove, while the latching means 12, 14 at least one of the rear portion 10b axially forwardly extending, resilient tongue 12 and attached to the front end, radially inwardly projecting and for entry into the annular groove 11 contains certain cams 14.
  • the latching means 12, 14 at least one of the rear portion 10b axially forwardly extending, resilient tongue 12 and attached to the front end, radially inwardly projecting and for entry into the annular groove 11 contains certain cams 14.
  • the locking means 11 could also be attached to the rear portion 10b and the locking means 12, 14 on the front portion 10a.
  • other than the locking means or snap connection elements shown could be provided, and instead of the locking means 11 and 12, 14, of course, other fasteners could be present.
  • the insert 3 and the inner sleeve 1 are axially connected to each other by a clamping connection, which contains at least one ball 15 and a band-ring spring 16 resting against the circumference of the inner sleeve 1.
  • the ball 15 is disposed in a radial recess of the inner sleeve 1 and limited by the elastic biasing force of the radially outboard adjacent band ring spring 16, but so far radially inwardly movable that they formed in a formed on the outer periphery of the hexagonal portion of the insert 3 notch enter and therefore can fix it axially in the inner sleeve 1.
  • a sufficient clamping effect can be achieved even without the presence of a notch.
  • clamping connections can be advantageous as well as a snap ring 5 (Fig. 1) over the application of a second permanent or holding magnet 9 ( Figure 3), as this can not affect the effect of the first permanent magnet 7 and Therefore, no adaptation of the two permanent magnets 7 and 9 to each other is required.
  • the two-part variant of the outer sleeve 10 according to FIGS. 5 and 6 has the advantage that the front portion 10a is easily exchangeable. As a result, the front portion 10a can be replaced if necessary against a front portion, which is designed for a different diameter or a different shape or size of the profile tip 3a and z. B. may also have another permanent magnet 7 with a larger or smaller contact surface 7b. This is particularly advantageous because screws with the same inner profile, z. B. a Pozidriv profile of size 2, depending on the thread diameter have different head diameter. For screws with smaller head diameters an annular permanent magnet 7 is expediently chosen, which has a smaller aperture, so that the largest possible contact surface 7 b is given for the screw head 4 a. Finally, the two-part variant facilitates the replacement of the inserts 3, since their profile tips 3a after removal of the front portion 10a easily detected by hand and then they can be pulled out of the inner sleeve 1.
  • FIGS. 7 to 9 wherein the same parts are used with the same reference numerals as in the embodiments described above, the preselected axial position of the outer sleeve 10 formed in accordance with FIGS. 5 and 6 by means of a spring 17 shown here as a helical compression spring ,
  • the spring 17 is mounted on the drive shaft 2 and supported between the rear end of the inner sleeve 1 and the front end of the rear portion 10 b of the outer sleeve 10.
  • the outer sleeve 10 is axially positioned so far in the direction of the drive shaft 2 that it and the permanent magnet used in the front end 7 assumes the preselected axial position relative to the profile tip 3a of the screwdriver insert.
  • FIG. 7 to 9 also show a variant in which the preselected axial position of the outer sleeve 10 on the inner sleeve 1 is adjustable without the screwing device having to be disassembled and, if necessary, provided with a different spacer sleeve 8 (FIG. 1).
  • the drive shaft 2 is provided in a protruding from the neck 10c and the rear portion 10b area with an external threaded portion on which a with a corresponding female threaded adjusting nut 18 is turned on, to which 17 can create the rear portion 17b under the action of the spring.
  • the axial movement of the outer sleeve 10 is limited in this case in one direction by abutment of the rear portion 10 b to the adjusting nut 18 and in the opposite direction by abutment of the rear portion 10 b to the compressed spring 17.
  • the adjusting nut 18 can be set once when commissioning the screw so that the used in each case profile tip 3a at the stop of the outer sleeve 10 to the adjusting nut 18 just as much from the permanent magnet 7 projects forward as the sum of the prescribed penetration depth and corresponds to the tolerance S described with reference to FIGS. 1 and 2. This position can then be determined with a likewise turned onto the drive shaft 2 lock nut 19.
  • the function of the invention can be achieved in the same manner as described above with reference to FIGS. 1 and 2. It is only necessary for this, the force (in this case the compressive force) of the spring 17 to be selected such that it retracts the outer sleeve 10 always unused screwing in the apparent from Fig. 7 preselected starting position, but on the other hand when approaching a screw head 4a weaker is, as the tensile force of the permanent magnet 7 corresponds. As a result, the outer sleeve 10, as in the case of FIGS.
  • FIG. 7 to 9 corresponds to the embodiments already described above.
  • the outer sleeve 10 is here provided with a permanent magnet 20, in which a front bearing surface 20a is provided with a conical or dome-shaped depression. Therefore, this embodiment is particularly suitable for screws 21 with lens heads 21 a, the end surfaces are rounded in contrast to the substantially flat end surfaces 4 b normal countersunk screws 4 (eg., Fig. 1). The better this is the contact surface 20a with its sinking to the Rounding the screw heads 21 a is adjusted, the better the achieved adhesion of the screws 21 to the screwing.
  • FIG. 10 corresponds to that of FIG. 7 to 9.
  • FIGS. 5 to 10 also show a variant in which the screwing device can be held and guided with the fingers when necessary during a screwing operation.
  • a third sleeve 22 is mounted on the outer sleeve 10, which is easily rotatably supported between a shoulder in the front portion 10a and a shoulder at the front end of the locking means 11 of the rear portion 10b.
  • the spacer sleeve 8 shown in FIGS. 1 to 4 is made in one piece with the outer sleeve 6 and formed as an integrally formed at the front end, radially inwardly projecting, annular projection 6b, at least as the spacer sleeve 8 is partially penetrated by the profile tip 3a. So that an assembly of the screwing device by attaching the outer sleeve 6 is possible on the inner sleeve 1, missing at the rear end of the outer sleeve of the neck 6a. Instead, in the embodiment of FIG. 11, a pot-like, alspreßbares on the rear end of the outer sleeve 6 tail 23 is provided.
  • the end piece 23 has a passage for the drive shaft 2 and can be firmly connected to the outer sleeve 6, after it has been mounted on the inner sleeve 1.
  • a be pressed into the rear end of the outer sleeve 6 sleeve 24 may be provided which is analogous to the end piece 23 provided with a passage for the drive shaft 2 and can be mounted.
  • the two embodiments of FIGS. 11 and 12 correspond to that of FIGS. 1 and 2, which is why the same parts are provided with the same reference numerals.
  • the spacer sleeve 8 is replaced by a spacer in the form of a spring 25, here a helical compression spring.
  • a spring 25 here a helical compression spring.
  • This is supported with a rear end on a shoulder formed at the front end of the inner sleeve 1, while its front end for abutment against a rear abutment surface 7c of the permanent magnet 7 is determined.
  • the inner sleeve 1 is at the front end expediently compared to Fig. 1 and 2 shortened so much that the hexagonal shank of the screwdriver bit 3 on the one hand further protrudes from the inner sleeve than in the constructions shown in FIG.
  • the spring 25 could, for example, also be arranged between the inner sleeve 1 and the shoulder 10d of the outer sleeve 10 (FIGS. 5, 6) or the shoulder 6b of the outer sleeve 6 (FIGS. 11, 12).
  • the axially acting force of the spring 25 is matched to the magnetic force of the permanent magnet 7, which in the apparent from Fig. 13 equilibrium position abutting the front end of the coil spring 25 permanent magnet 7 and thus the outer sleeve 6, the above with reference to FIGS 2 occupy preselected axial positions.
  • the spring 25 is preferably in a substantially relaxed state, so that its front end as in Fig. 1, the front end of the spacer sleeve 8 essentially serves only as a stop for the permanent magnet 7. If, therefore, the profile tip 3a of the insert 3 is inserted analogously to FIG. 2 into the inner profile of the screw head 4a (FIG.
  • the magnetic force automatically causes the outer sleeve 6 to move axially in such a way that, on the one hand, the profile tip 3a is fully inserted into the inner profile of the screw head 4a penetrates and on the other hand, the screw head 4a to the front abutment surface 7b of the permanent magnet 7 applies.
  • the rear abutment surface 7c of the permanent magnet can, as shown in FIG. 14, lift off axially from the front end of the helical compression spring 25, which is in this case inoperative.
  • a significant advantage of the spring 25 is that the outer sleeve 6 with the fingers and under compression of the spring 25 from the position of FIG. 13 further axially to the rear, ie in the direction of the drive shaft 2 can be moved, as shown in FIG is.
  • the front end of the outer sleeve 6 axially pushed back so far relatively behind the profile tip 3a of the insert 3, that the profile tip 3a is practically completely free or at least so far forward over the permanent magnet 7 projects that it easily detected with the fingers and out of the Device can be pulled out. This would not be possible if the outer sleeve 6 as in the embodiments of FIGS.
  • FIGS. 13 to 15 shows that the axial positions of a formed in the inner sleeve 1 annular groove 5a with inserted snap ring and formed in the hexagonal shank of the insert 3 notches 5b are selected so that the resilient snap ring 5 is not fully inserted into the indentations 5b when inserted into the inner sleeve 1 until it stops, but partially lodges against an inclined surface of the annular groove 5b.
  • the axial extraction of the insert 3 forward with the fingers is facilitated without a pair of pliers or the like. Must be taken to the aid. This is true even if small burrs are present on the wire ends of the blast or spring ring 5 due to production. Nevertheless, even with this arrangement, the clamping force caused by the snap ring 5 remains sufficiently large to securely hold the insert 3 in the inner sleeve 1 when working.
  • a third sleeve 22 may preferably be rotatably mounted on the outer sleeve 6, which corresponds to the sleeve 22 in Fig. 4 to 10, or the outer sleeve having a jacket 26 made of plastic.
  • FIGS. 16 to 18 corresponds to the embodiment of FIGS. 13 to 15 with the difference that the helical compression spring 25 is missing.
  • the force of the permanent magnet 7 and the dimensions of the inner sleeve 1 and outer sleeve 6 are designed so that the function described with reference to the above embodiments, then results when the outer sleeve 6 in the unused state about an apparent from Fig. 16 intermediate position occupies. In this intermediate position, however, it is not a fixed by a Hubbegrenzungssch for the permanent magnet 7 and the outer sleeve 6, stable position, which automatically adjusts when not using the device, but a largely labile position.
  • the hexagonal shank 3 of the insert in the inner sleeve 1 is held either by a snap ring 5, a permanent magnet 9 or by the ball 15, biased by the annular spring 16.
  • the hexagonal shank of the insert 3 is held by a ball 27, which is guided in a radial bore in the front region of the extension 1a.
  • the ball is moved radially inwardly until it engages in the formed on the outer circumference of the hexagonal portion of the insert 3 notch.
  • the radial movement is effected by a cone 30, which is incorporated in the front region of the axial bore of the sleeve 29 and in the contact position with the ball 27, the force acting by a spring 28 on the sleeve 29 axial force converts into a radially acting force.
  • a differently shaped clamping element can be provided, which moves in a radially incorporated into the extension 1a slot substantially radially.
  • the axial movement of the sleeve 29 is not limited by clamping with the clamping element, so if there is no use in the recording, the axial movement is limited by the securing ring 31 to the front.
  • the spring 28 is supported by the rear end on a shoulder which is formed where the inner sleeve 1 merges into the extension 1a.
  • the outer sleeve 6 is guided axially displaceably substantially on the inner sleeve 1, as an additional guide, the lateral surface of the sleeve 29 can be provided.
  • the spring 25 On the front side of the sleeve 29, the spring 25 is supported, which pushes the outer sleeve 1 with the ring magnet 7 in the preselected position to the tip 3a of the insert.
  • the pushing back of the sleeve 29 is effected in that the outer sleeve 6 is pushed back until the spring 25 is so far stretched or compressed that the force acting on the sleeve 29 from the front force is greater than the force of Spring 28 and the sleeve 29 are pushed back so far can, that the ball 27 or another clamping element to escape radially outward and the clamping of the hexagonal portion of the insert 3 is released.
  • extension 1a The dimensions of the extension 1a, the distance from its front to the ring magnet 7, the lengths of the springs 25 and 28 in the compressed state and the length of the sleeve 29 are adjusted so that when pushed back to the compressed springs 25 and 28 outer sleeve 6 of the screwdriver bit 3 protrudes with its front far from the screw, can be well grasped with the fingers and pulled out of the screw.
  • Fig. 21 shows a device according to the invention, which substantially corresponds to the embodiment of FIG. 13.
  • the embodiment according to FIG. 21 has a stop sleeve 32 in the rear region of the device, which is pressed or pushed onto the shaft 2 and secured with the spring ring 35, and with the front end 33 against the shaft Rear end of the inner sleeve 1 abuts the extended opening in the neck 6a of the outer sleeve 6, 10 protrudes and forms a stop with the rear end 34, which prevents the shaft 2 of the device too far into the receptacle, for example, a three-jaw chuck, a Electric screwdriver is inserted and about the front of the three-jaw chuck on the back of the outer sleeve 6, 10 comes to rest, so that an axial movement of the outer sleeve to the rear is no longer possible.
  • the shaft 2 could have a collar at this point as a stop.
  • the stop sleeve 32 and a collar preferably have a circular peripheral contour, so that the outer sleeve 6, 10 can rotate on the inner sleeve 1 and the stop sleeve 32.
  • the stop is formed by a spring ring, which is embedded in a groove in the shaft 2 at the appropriate place and whose peripheral diameter is greater than the diameter of the shaft.
  • all embodiments shown in the figures can also be provided with a stop sleeve or collar.
  • All described embodiments have on the one hand the desired function in common, namely that the screw 4, 21 is held securely and in a coaxial position with the screwdriver bit 3 at the front end of the screwing and at the same time the profile tip 3a to the full surface contact with the inner profile in the Screw heads 4a, 21a immersed.
  • the coaxial position of the screw 4 is achieved in that the outer sleeve 6 has a precise and relatively long guide on the inner sleeve 1, thus the end-face contact surface 7b of the permanent magnet 7 is always at right angles to the axis of the screwdriver bit 3 and the screw is not is pulled by an approximately non-perpendicular to the axis stationary contact surface 7b in an inclined position and so stops, it no longer comes to a coaxial centering of the screw through the inner profile in the screw head 4a on the Profile Spotify3a.
  • the later behavior of the outer sleeve 6, 10 when screwing a screw 4, 21 is largely insignificant. When screwing the screw 4, 21 act namely, as usual, exerted by the power wrench or the like.
  • the main constructive features of the device in the various embodiments are that the outer sleeve 6, 10 is axially slidably and rotatably guided in two directions axially displaceable and rotatable with the permanent magnet 7 inserted into its end face on the inner sleeve 1, that the dimensions and shapes of the inner sleeve 1 and the outer sleeve 6, 10 and the magnetic force are chosen so that under the action of the magnetic force and / or the positioning of the sleeves to each other influencing elements, such as spring, spacer sleeve, the outer sleeve to the inner sleeve in a starting position occupies a position in which the inserted into the inner sleeve 1 commercially available screwdriver bit 3 with its profile tip 3a from the opening of the profile tip comprehensive permanent magnet protrudes so far that the outstanding length by the tolerance dimension s is greater than the largest occurring depth of the inner profile in one of the profile tip 3a associated screw type.
  • the invention is not limited to the described embodiments, which can be modified in many ways. This applies initially to the type of screwdriver inserts used, in particular their profile tips, and the associated screws. Torx, Pozidriv, and other screws and related inserts may be used instead of screws with internal Phillips profiles. Further, the invention is not limited to the described embodiment of the inner and outer sleeves. If the advantages of the rotatable outer sleeve can be disregarded, it could also be performed non-rotatably on the inner sleeve with a cylindrical cross-section other than cylindrical. Furthermore, the contact surfaces for the screw heads need not necessarily be formed on the permanent magnets 7, 20 themselves.
  • the front end faces of the permanent magnets 7, 21 and the outer sleeves 6, 10 in one plane and to bring the screw heads at least partly into contact with the front end faces of the outer sleeves.
  • the contact surfaces are formed by the front end faces of a resting on the permanent magnet pole plate.
  • the outer and inner sleeves do not necessarily consist of non-ferromagnetic materials, although materials such. As stainless steel, brass or aluminum od. Like. For her preference.
  • screwdriver bits are made with shaft cross-section 4 mm, 1/4 "and 8 mm hexagon.
  • the parts of the device intended to accommodate the screwdriver shanks must of course be adapted to the various dimensions, including the width the opening in the Permanent magnets, while other parts may remain the same. However, it seems appropriate to adjust the total screwing the dimensions of the different sizes of screwdriver bits.
  • screwing can be adapted according to the design principle of the invention as a special version of special versions of screwdriver inserts, including, for example, those with a round shaft cross-section and a driver surface.

Claims (23)

  1. Dispositif de vissage pour visser à fond des vis (4, 21) en matériau ferromagnétique qui présentent des têtes de vis (4a, 21a) pourvues de profils intérieurs, constitué d'une douille intérieure (1) destinée à recevoir en solidarité de rotation et en blocage axial un embout de tournevis (3) réalisé en un matériau ferromagnétique, lequel présente une pointe profilée (3a) dépassant du côté avant de la douille intérieure (1) et destinée à s'enfoncer dans les profils intérieurs des têtes de vis (4a, 21a), d'une queue d'entraînement (2) reliée à la douille intérieure, et d'une douille extérieure (6, 10) entourant au moins partiellement la douille intérieure (1) et dans le côté avant de laquelle est encastré un aimant permanent annulaire (7, 20) qui est pourvu d'une brèche (7a) traversée par la pointe profilée (3a) de l'embout de tournevis (3) et qui présente une face d'application (7b, 20a) magnétiquement active, destinée à l'application des têtes de vis (4a, 21a), caractérisé en ce que la douille extérieure (6, 10) est montée et guidée à coulissement en va-et-vient axialement limité sur la douille intérieure (1) et, lorsque l'embout de tournevis (3) est installé, peut être amenée automatiquement ou manuellement dans une position axiale présélectionnée, de telle sorte que, lors de la mise en place d'une vis (4) sur la pointe profilée (3a), par la force magnétique de l'aimant permanent (7, 20), non seulement la douille extérieure (6, 10) pourvue de l'aimant permanent (7, 20) est rapprochée de la tête de vis (4a) jusqu'à ce que la face frontale (7b) de l'aimant permanent s'applique contre la face terminale (4b) de la tête de vis, mais aussi la tête de vis (4a) est rapprochée de la pointe profilée (3a) jusqu'à ce que la pointe profilée s'applique sur toute sa surface dans le profil intérieur de la tête de vis (4a).
  2. Dispositif de vissage selon la revendication 1, caractérisé en ce qu'un écarteur (8) constitué d'un matériau non ferromagnétique est disposé entre l'aimant permanent (7, 20) et la douille intérieure (1) en étant coaxial à cette dernière.
  3. Dispositif de vissage selon la revendication 2, caractérisé en ce que l'écarteur est un écarteur (8) disposé dans l'extrémité avant de la douille extérieure (6).
  4. Dispositif de vissage selon la revendication 2, caractérisé en ce que l'écarteur (8) est un appendice (6b, 10d) fabriqué d'un seul tenant avec la douille extérieure (6, 10).
  5. Dispositif de vissage selon l'une des revendications 1 à 4, caractérisé en ce que la queue (2) présente une butée qui consiste en une douille de butée (32) qui est emmanchée ou enfilée en ajustement glissant sur la queue (2) et est assujettie axialement par la rondelle-ressort (35) et bute par l'extrémité avant (33) contre l'extrémité arrière de la douille intérieure (1), ou bien la queue (2) présente un collet solidaire qui dépasse par son diamètre du profil hexagonal et qui correspond dans son étendue et sa section à la douille de butée, ou bien la butée est constituée uniquement d'une rondelle-ressort insérée dans une rainure dans la queue (2) et dépassant du profil de la queue.
  6. Dispositif de vissage selon la revendication 5, caractérisé en ce que la douille extérieure (6) est réalisée d'une seule pièce et est pourvue à son extrémité arrière d'un appendice (6a, 10c) destiné à limiter sa faculté de coulissement axial.
  7. Dispositif de vissage selon la revendication 6, caractérisé en ce que la douille extérieure (10) est réalisée en deux parties et l'appendice (10c) est une partie d'un tronçon arrière (10b) pouvant être relié de manière détachable à un tronçon avant (10a) de la douille extérieure (10), et le tronçon avant (10a) et le tronçon arrière (10b) sont pourvus de moyens de crantage (11 ; 12, 14) destinés à réaliser une liaison axiale.
  8. Dispositif de vissage selon la revendication 7, caractérisé en ce que les moyens de crantage comprennent une rainure annulaire (11) sur un tronçon (10a) et, sur l'autre tronçon (10b), des languettes élastiques (12) pourvues d'ergots (14) destinés à s'enclencher dans la rainure annulaire (11).
  9. Dispositif de vissage selon l'une des revendications 1 à 8, caractérisé en ce que l'embout (3) et la douille intérieure (1) sont pourvus de moyens de crantage (15, 16, 27, 28, 29, 30) destinés à réaliser une liaison axiale.
  10. Dispositif de vissage selon l'une des revendications 1 à 9, caractérisé en ce que la disposition et l'harmonisation des éléments sont conçues de telle sorte que la douille extérieure (6, 10) est réglée dans une position présélectionnée sur la douille intérieure (1) par la force magnétique de l'aimant permanent (7, 20) et éventuellement d'un deuxième aimant permanent (9).
  11. Dispositif de vissage selon l'une des revendications 7 à 10, caractérisé en ce que la douille extérieure (10) est positionnée au moins partiellement dans la position axiale présélectionnée par un ressort hélicoïdal (17) enfilé sur la queue d'entraînement (2) et soutenu entre un côté arrière de la douille intérieure (1) et l'appendice (10c).
  12. Dispositif de vissage selon l'une des revendications 7 à 11, caractérisé en ce que la position présélectionnée peut être réglée par le fait que la queue d'entraînement (2) présente, dans une région dépassant axialement hors de l'appendice (10c), une partie de filetage extérieur sur laquelle est vissé un écrou de réglage (18) pourvu d'un filetage intérieur, s'appliquant contre l'appendice (10c).
  13. Dispositif de vissage selon l'une des revendications 10 à 12,
    caractérisé en ce que la position axiale présélectionnée est réglée de telle sorte que la pointe profilée (3a), dans cette position de la douille extérieure (6, 10), dépasse de la face d'application (7b) vers l'avant de la profondeur de pénétration maximale dans le profil intérieur de la tête de vis (4a) plus une cote de tolérance (s), mais que la douille extérieure (6, 10) continue à être axialement coulissante.
  14. Dispositif de vissage selon l'une des revendications 1 à 13, caractérisé en ce que la douille extérieure (6, 10), lorsque l'embout (3) est totalement inséré dans la douille intérieure (1), peut être déplacée axialement en direction de la queue d'entraînement (2) d'un montant tel au-delà de la position présélectionnée que la pointe profilée (3a) dépasse de la face d'application (7b) de l'aimant permanent (7) vers l'avant d'un montant supérieur à la profondeur de pénétration maximale plus une cote de tolérance (s).
  15. Dispositif de vissage selon la revendication 14, caractérisé en ce que l'écarteur est un ressort (25) disposé devant le côté frontal de la douille intérieure (1).
  16. Dispositif de vissage selon la revendication 15, caractérisé en ce que la longueur et/ou la force du ressort sont choisies de telle sorte que la douille extérieure (6) prend la position présélectionnée dans un état essentiellement détendu du ressort (25).
  17. Dispositif de vissage selon l'une des revendications 1 à 16, caractérisé en ce que la face d'application (7b, 20a) est formée par une face frontale avant de l'aimant permanent (7, 20) et est plane ou adaptée à la forme des faces terminales des têtes de vis (21a) et réalisée par exemple avec une concavité correspondante.
  18. Dispositif de vissage selon l'une des revendications 1 à 17, caractérisé en ce que la douille extérieure (6) présente un enrobage (26) en matière plastique.
  19. Dispositif de vissage selon l'une des revendications 1 à 18, caractérisé en ce que l'embout (3) est pourvu d'encoches (5b) et la douille extérieure (6) d'une rainure annulaire (5a) pour recevoir un jonc d'arrêt (5) assujettissant l'embout (3), sachant que la position du jonc d'arrêt (5) dans la douille intérieure (1), lorsque l'embout (3) repose sur la face frontale de la queue d'entraînement (2), est axialement décalée par rapport à la position des encoches (5b) dans l'embout (3) dans une mesure telle que le jonc d'arrêt (5) ne s'enclenche que partiellement dans les encoches (5b).
  20. Dispositif de vissage selon l'une des revendications 1 à 19, caractérisé en ce qu'une position finale axiale de la douille extérieure (6) par rapport à la douille intérieure (1) est délimitée, sur un côté arrière du dispositif, par un appendice (6a) ou une bague (24) à une extrémité arrière de la douille extérieure (6) et, sur un côté avant du dispositif, par l'aimant permanent (7) ou un appendice (6b) d'étendue axiale raccourcie.
  21. Dispositif de vissage selon les revendications 1, 2, 5, 6 et 18 à 20, caractérisé en ce qu'une queue hexagonale de l'embout (3) est reçue dans un prolongement (1a) de la douille intérieure (1), une douille (29) est disposée à coulissement axial sur le prolongement (1a), et au moins un élément de serrage (27) est monté dans un perçage radial ou une entaille radiale dans le prolongement (1a) et est pressé radialement contre la queue hexagonale par un cône (30) ménagé dans la région avant de la douille (29), sous l'action d'une force d'un ressort (28) agissant axialement sur la douille (29), et un ressort (25) est disposé dans l'espace intermédiaire entre le côté frontal de la douille (29) et l'aimant permanent (7), ressort dont les dimensions et/ou la force sont d'une part prévues de telle sorte que, dans un état essentiellement détendu du ressort (25), la douille extérieure (6) pourvue de l'aimant permanent (7) prend la position présélectionnée par rapport à la pointe profilée (3a), sachant que, d'autre part, dans l'état comprimé, le ressort (25) repousse la douille (29) dans une mesure telle que la partie élargie du cône (30) ménagé dans le perçage de la douille vient se placer au-dessus de l'élément de serrage (27).
  22. Dispositif de vissage selon la revendication 21, caractérisé en ce que les dimensions du prolongement (1a), la distance entre son côté avant et l'aimant annulaire (7), la longueur des ressorts (25) et (28) dans l'état comprimé et la longueur de la douille (29) sont harmonisées de telle sorte que la douille extérieure (6) peut être suffisamment repoussée pour que l'embout de tournevis (3) dépasse par sa partie avant hors du dispositif de vissage suffisamment pour pouvoir être correctement saisi avec les doigts et retiré du dispositif de vissage.
  23. Dispositif de vissage selon l'une des revendications 1 à 22, caractérisé en ce que la douille extérieure (6, 10) est montée à rotation sur la douille intérieure (1).
EP02010975A 2001-05-17 2002-05-16 Dispositif à visser pour des embouts de tournevis Expired - Lifetime EP1260319B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10125218 2001-05-17
DE10125218 2001-05-17
DE10148943A DE10148943B4 (de) 2001-05-17 2001-10-02 Schraubvorrichtung für Schraubendreher-Einsätze
DE10148943 2001-10-02

Publications (3)

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EP1260319A2 EP1260319A2 (fr) 2002-11-27
EP1260319A3 EP1260319A3 (fr) 2005-02-23
EP1260319B1 true EP1260319B1 (fr) 2007-12-19

Family

ID=26009374

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EP02010975A Expired - Lifetime EP1260319B1 (fr) 2001-05-17 2002-05-16 Dispositif à visser pour des embouts de tournevis

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EP (1) EP1260319B1 (fr)
AT (1) ATE381414T1 (fr)
DE (1) DE50211385D1 (fr)
ES (1) ES2298307T3 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011000710A1 (de) 2011-02-14 2012-08-16 Wera-Werk Hermann Werner Gmbh & Co. Kg Drehmomentübertragungseinrichtung in Form eines Bitfutters
US8747043B2 (en) 2010-01-13 2014-06-10 National Nail Corp. Fastener, installation tool and related method of use
US9120214B2 (en) 2010-01-13 2015-09-01 National Nail Corp. Fastener, installation tool and related method of use
US9144896B2 (en) 2010-01-13 2015-09-29 National Nail Corp. Fastener, installation tool and related method of use

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WO2005000530A1 (fr) * 2003-06-25 2005-01-06 Vessel Industrial Co., Ltd. Dispositif de maintien de meche
WO2005017368A2 (fr) * 2003-08-18 2005-02-24 Felo-Werkzeugfabrik Holland-Letz Gmbh Dispositif magnetique de maintien de vis
EP1508406A3 (fr) * 2003-08-18 2005-05-11 Felo-Werkzeugfabrik Holland-Letz Gmbh Dispositif de retenue pour tournevis
DE102005017872A1 (de) * 2005-04-19 2006-10-26 Wera-Werk Hermann Werner Gmbh & Co. Kg Futter mit einem einstellbaren Tiefenanschlag
US9802300B2 (en) 2010-01-13 2017-10-31 National Nail Corp. Fastener, installation tool and related method of use
CN105563408A (zh) * 2016-03-17 2016-05-11 叶淑惠 工具磁吸滑移装置
DE202018003837U1 (de) 2018-08-18 2018-09-20 Andreas Rack Inline-Mehrfachsteckschlüssel

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US3253626A (en) * 1964-08-03 1966-05-31 Gardner Denver Co Magnetic tool
US3392767A (en) * 1965-11-15 1968-07-16 Gardner Denver Co Magnetic tools
US3347293A (en) * 1965-12-23 1967-10-17 Magna Driver Corp Removable bit construction for screwdrivers and the like
DE3704356A1 (de) * 1986-02-20 1987-08-27 Volkswagen Ag Fuehrungshuelse auf einem schrauberschaft
JP3091663B2 (ja) * 1995-02-28 2000-09-25 日東精工株式会社 ビット
DE19907837A1 (de) * 1999-02-24 2000-09-14 Schmidt Ulrich Ush Schraubwerk Schraubwerkzeug mit magnetischer Widerlagerfläche

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8747043B2 (en) 2010-01-13 2014-06-10 National Nail Corp. Fastener, installation tool and related method of use
US9120214B2 (en) 2010-01-13 2015-09-01 National Nail Corp. Fastener, installation tool and related method of use
US9144896B2 (en) 2010-01-13 2015-09-29 National Nail Corp. Fastener, installation tool and related method of use
DE102011000710A1 (de) 2011-02-14 2012-08-16 Wera-Werk Hermann Werner Gmbh & Co. Kg Drehmomentübertragungseinrichtung in Form eines Bitfutters
WO2012110453A1 (fr) 2011-02-14 2012-08-23 Wera - Werk Hermann Werner Gmbh & Co. Kg Dispositif de transfert de couple sous forme de mandrin pour mèches

Also Published As

Publication number Publication date
ATE381414T1 (de) 2008-01-15
EP1260319A2 (fr) 2002-11-27
EP1260319A3 (fr) 2005-02-23
ES2298307T3 (es) 2008-05-16
DE50211385D1 (de) 2008-01-31

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