EP1200229A1 - Dispositif pour desserrer plus facilement des pieces vissees - Google Patents

Dispositif pour desserrer plus facilement des pieces vissees

Info

Publication number
EP1200229A1
EP1200229A1 EP00945808A EP00945808A EP1200229A1 EP 1200229 A1 EP1200229 A1 EP 1200229A1 EP 00945808 A EP00945808 A EP 00945808A EP 00945808 A EP00945808 A EP 00945808A EP 1200229 A1 EP1200229 A1 EP 1200229A1
Authority
EP
European Patent Office
Prior art keywords
intermediate ring
counterpart
screw connection
inclination
inclined surfaces
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.)
Withdrawn
Application number
EP00945808A
Other languages
German (de)
English (en)
Inventor
Stefan Fenchel
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Publication of EP1200229A1 publication Critical patent/EP1200229A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • B24B45/006—Quick mount and release means for disc-like wheels, e.g. on power tools

Definitions

  • the invention relates to a device for easier loosening of a screw connection.
  • This device is intended for angle grinders so that the grinding wheel can be changed without tools.
  • Angle grinders work with a relatively small power of up to about 2kW, and the torques that occur are correspondingly small, namely up to about 200 numbers.
  • this known device cannot be used, for example, for core drilling machines which work with powers of up to 40 kW and with torques of approximately 1000 Nm.
  • the high forces that occur with such machines would easily destroy the projections.
  • the projections have a trapezoidal shape, which means that the inclined end faces are flat surfaces.
  • the base areas of the Accordingly, recesses are also formed as flat surfaces.
  • the flat surfaces can only come into contact with a very specific, exact angular position of the inner flange with respect to the counterpart. If there are slight deviations from this angular position, the contact between the end face of a projection and the base of a corresponding recess will only be along a line.
  • a flat design of the inclined surfaces is no problem for smaller machines, such as angle grinders, since the screw connection is tightened by hand and the inclined surfaces slide into a suitable position.
  • the inclination of the surfaces of the intermediate ring is now formed in the circumferential direction in a generic device for easier loosening.
  • An inclined surface is then almost a part of a helix.
  • the surface inclined in the circumferential direction is not a flat surface.
  • the surfaces of the counterpart are also inclined (helical) in the circumferential direction. This ensures that the surfaces always come into contact with each other in every angular position and a linear contact, which would lead to the destruction of the intermediate ring immediately with high forces, is excluded.
  • the high forces occurring in particular in core drilling machines can also be absorbed by the device for easier loosening without the destruction occurring.
  • Only with the configuration according to the invention is a device created which makes it possible to use it on machines with high forces, such as core drilling machines.
  • the intermediate ring also has a non-slip surface on its second side. This measure is necessary because during operation of the machine, for example a core drilling machine, enormous torsional forces occur due to the pressure exerted on the intermediate ring and due to the inclined surfaces, which in themselves cause the hissing ring and the counterpart to "slide together" along the inclined surfaces.
  • the device according to the invention would be ineffective, since when the screw connection is loosened, the intermediate ring and the counterpart would not be able to rotate relative to one another, since they are already as close as possible to one another in the axial direction, with the result that the pressure does not drop In order to prevent this collapse, the non-slip surface is provided, which just prevents the intermediate ring from rotating against the direction of thread rotation and from sliding against the counterpart.
  • the non-slip surface has the further advantage that when the screw connection is loosened, the intermediate ring first reliably faces one another rotates the counterpart and can take the tension off the thread, which is by no means a given the high forces with which the screw connection was tightened in use. This measure is not trivial, because one could initially assume that since the contact surfaces on the second side of the intermediate ring are larger than on the first side, the frictional forces on the second side should also be larger, which would make an additional grip unnecessary.
  • the formation of a non-slip surface significantly increases the reliability of the device.
  • This detaching effect can be adjusted by the angle of inclination of the inclined surfaces.
  • larger pitch angles which are defined as the angle between the surfaces and the plane perpendicular to the longitudinal direction of the screw connection, are used. Smaller pitch angles can be used for screw connections that tighten with smaller forces.
  • the intermediate ring and the counterpart are advantageously held together by holding means. Then they are always in the correct position relative to each other, both when tightening and when loosening the screw connection.
  • the holding means should consist of an elastic, preferably resilient material to allow sufficient rotation of the intermediate ring relative to the counterpart.
  • the holding means is a non-curing adhesive.
  • the holding means is formed by pins made of elastic material, the pins being connected both to the intermediate ring and to the counterpart.
  • the holding means is particularly advantageously formed by a retaining ring made of elastic material, which is connected both to the intermediate ring and to the counterpart and which is arranged in the region of the circumference of the intermediate ring and the counterpart, because then the gap between the intermediate ring and counterpart is through closed the retaining ring and no dirt can get into the space.
  • the device according to the invention can then function and function properly even under conditions in which a lot of dirt accumulates, as is the case, for example, in particular with core drilling machines, for example when drilling concrete.
  • the non-slip surface is formed by a rough surface. For example, small elevations, such as ribs or the like, can be provided on the side of the intermediate ring.
  • the grip of the non-slip surface can be determined by an applied to the surface, e.g. glued on, powder made of a hard material, in particular diamond, silicon carbide or hard metal.
  • a hard material in particular diamond, silicon carbide or hard metal.
  • the intermediate ring advantageously consists of a surface-hardened material.
  • the counterpart is a second intermediate ring which is identical to the first.
  • the two intermediate rings then only have to be screwed, the intermediate rings can be relatively thin and take up little space.
  • the counterpart is a screw head, a drilling head, a grinding wheel or another part to be fixed with the screw connection.
  • the additional intermediate ring has to be inserted in order to use the device according to the invention.
  • the intermediate ring could then be held directly on the counterpart, ie the drill head or the like.
  • the device according to the invention can be used with particular advantage for a screw connection with which a drill bit tube can be fixed in a core drilling machine, since particularly great forces occur here and when drilling, the drill bit tube is tightened strongly and was previously only releasable with correspondingly large forces, i.e. hammer blows , With the device according to the invention, the drill bit tube can be unscrewed by hand.
  • FIG. 1 shows a device according to the invention
  • FIG. 2 shows an intermediate ring of the device according to the invention from FIG. 1;
  • FIG. 3 shows an embodiment of the device according to the invention in cross section along the line IV-IV from FIG. 1;
  • Fig. 4 shows another embodiment of the invention
  • FIG. 5 shows a screw connection for fastening a core drilling tube to a core drilling machine with the device according to the invention.
  • a device 10 according to the invention has an intermediate ring 12 and a counterpart 14, which is also an intermediate ring 16 in a first exemplary embodiment (FIG. 1).
  • the device 10 shown is designed for screw connections with a right-hand thread.
  • the intermediate ring 12 shown individually in FIG. 2 has teeth on its first side 18, the teeth 20 of which are formed by surfaces 22 arranged in the circumferential direction, which are slightly inclined in the circumferential direction with respect to a plane E perpendicular to the longitudinal direction L of a screw connection, in such a way that the inclination of the surfaces 22 of the thread pitch is opposite. Due to the formation of the inclination in the circumferential direction, the inclined surfaces 22 are not flat surfaces but are quasi parts of a helix. This becomes particularly clear if only one surface were available, which would also be possible in principle, which would then represent a piece of a spiral that rotates through 360 ° and has a specific pitch angle ⁇ .
  • the angle of inclination ⁇ that is to say the angle between the surfaces 22 and the plane E, is positive.
  • the angle of inclination which could also be referred to as a pitch angle, can be relatively small in magnitude, e.g. a few degrees.
  • Steep flanks 24 are arranged between two adjacent teeth 20, which can preferably be rounded (not shown).
  • the intermediate ring On its second side 26, the intermediate ring has a non-slip surface 28, which can be formed by ribs 30 running radially on the side 26 or other geometric elevations.
  • the grip of the surface is realized by a powder, for example glued on, made of a hard material, in particular diamond, silicon carbide or hard metal.
  • the second intermediate ring 16 provided as counterpart 14 in the first exemplary embodiment shown in FIG. 1 is identical to the intermediate ring 12 with teeth 32 with inclined surfaces 33 and non-slip surface 34. In the assembled position (FIG. 1), the second intermediate ring 16 is merely positioned rotated by 180 ° about the plane E with respect to the first intermediate ring 12.
  • the surfaces 33 of the teeth 32 of the second intermediate ring 16 come to bear against the surfaces 22 of the teeth 20 of the first intermediate ring 12.
  • the angles of inclination of the surfaces 33 and the surfaces 22 are identical, so that when the intermediate ring 12 and counterpart 14 lie against one another, the surfaces 22 and 33 can lie on the entire surface. If the intermediate ring and counterpart come to lie on top of one another, as shown in FIG. 1 and as is also realized by holding means described in more detail below, approximately 90% of the total area has come into contact.
  • a thin layer 36 of a resilient material is arranged at least in some areas between at least some of the surfaces 22 and 33 that come into contact, the function of which is explained below.
  • the intermediate ring 12 and the counterpart 14 are held together by holding means 38.
  • the holding means 38 is preferably formed from an elastic material, so that the intermediate ring 12 and the counterpart 14 are held in the correct position before screwing together a screw connection and can still be rotated relative to one another.
  • the holding means 38 can comprise one or more pins 40 made of rubber-elastic material, the ends of which are each fixed in the intermediate ring 12 and the counterpart 14 (FIG. 3).
  • the holding means 38 could also be formed by a holding ring 42 which is firmly connected both to the intermediate ring 12 and to the counterpart 14.
  • the intermediate ring 12 has a step 44 on the edge of its first side 18 and the counterpart 14 has one corresponding stage 46 on which the retaining ring 42 is mounted and fixed, for example glued.
  • FIG. 5 shows an application example.
  • a drill bit tube 56 can be screwed onto a drive shaft 50 of a motor 52 of a core drilling machine 54.
  • the device 10 according to the invention is arranged between a stop 58 of the drive shaft 50 and the tube 56 and is first plugged onto a threaded rod 60 of the tube 56.
  • the screw connection between the drive shaft 50 and the tube 56 will tighten.
  • the surfaces 22 and 33 of the device 10 come into mutual contact. If tightened further, the intermediate ring 12 and the counterpart 14 cannot rotate further against one another, since the inclined surfaces 22 and 33, the inclination of which counteracts the thread pitch, would push them apart in the axial direction, which is not possible.
  • the grippy surfaces 28 and 34 of the intermediate ring 12 or counterpart 14 press with their elevations 30 into the abutting stop 58 of the drive shaft 50 and the corresponding stop 59 of the tube 56.
  • the diamond granules will press into the surfaces 28 and 34 on the one hand and into the stops 58 and 59 on the other hand, regardless of the degree of hardness of the materials used.
  • the tube 56 is now rotated in the direction of the arrow relative to the drive shaft 50. Since the tube 56 with the counterpart 14 and the drive shaft 50 with the intermediate ring 12 are frictionally connected to one another via the non-slip surfaces 28 and 34, initially only the intermediate ring 12 can rotate relative to the counterpart 14. Even with minimal twisting against each other, the pressure on the thread is immediately removed, since the intermediate ring 12 and that Counterpart 14 can move axially towards each other due to the inclined surfaces 22 and 33. When the pressure is removed from the thread, the tube 56 can even be completely unscrewed by hand.
  • an essential feature of the device 10 according to the invention is the inclined surfaces 22 and 33. These do not necessarily have to be designed as flanks of teeth. In principle, other shapes are also conceivable as long as inclined surfaces are formed with a corresponding angle of inclination, which can come into mutual contact.
  • the flanks 24 of the intermediate ring 12 must have a sufficient distance in the circumferential direction from the corresponding flanks of the counterpart 14 (FIG. 1), so that the counterpart 14 is loosened relative to the intermediate ring 12 can turn back at least a minimal distance. This only needs to be a few degrees or only a fraction of a degree, depending on the size of the angle of inclination ⁇ .
  • the layer 36 and / or the holding means 38 ensure that the intermediate ring 12 and the counterpart 14 are held in such a position relative to one another before the screw connection is tightened that when the surfaces 22 and 33 come into contact when tightening, the latter there is sufficient distance between the flanks.
  • the intermediate ring is made in one piece with a tool, for example a drill bit tube, and the counterpart is made in one piece with a drill connection.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Gripping On Spindles (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Abstract

L'invention concerne un dispositif pour desserrer plus facilement des pièces vissées. Ce dispositif comprend une bague intermédiaire (12) qui présente sur son premier côté (18) au moins une surface (22) légèrement incliné par rapport à un plan (E) perpendiculaire à la direction longitudinale (L) des pièces vissées. Il comprend également un élément correspondant (14) qui présente, sur son côté dirigé vers la bague intermédiaire (12), des surfaces (33) également inclinées, possédant le même angle d'inclinaison (α) que les surfaces (22) de la bague intermédiaire (12). Les surfaces inclinées (22 et 33) viennent en contact les unes avec les autres lors du serrage des pièces vissées. L'inclinaison (α) des surfaces inclinées (22 et 33) est opposée au pas de filetage des pièces vissées. L'invention vise à améliore ce dispositif de manière à permettre de desserrer le plus facilement possible des pièces vissées, qui se sont bloquées en cours d'utilisation, sans avoir recours à des forces excessives, notamment sans donner de coups sur le filetage, et de manière à pouvoir utiliser ledit dispositif de façon fiable pour des machines de grandes puissances, par exemple pour des sondeuses-carotteuses. A cet effet, l'inclinaison des surfaces (22) de la bague intermédiaire (12) et l'inclinaison des surfaces (33) de l'élément correspondant (14) sont orientées vers la périphérie, et la bague intermédiaire (12) présente sur son deuxième côté (26) une surface (28) assurant un bon maintien.
EP00945808A 1999-07-06 2000-06-23 Dispositif pour desserrer plus facilement des pieces vissees Withdrawn EP1200229A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19930919 1999-07-06
DE1999130919 DE19930919C2 (de) 1999-07-06 1999-07-06 Vorrichtung zum leichteren Lösen einer Schraubverbindung
PCT/EP2000/005830 WO2001002137A1 (fr) 1999-07-06 2000-06-23 Dispositif pour desserrer plus facilement des pieces vissees

Publications (1)

Publication Number Publication Date
EP1200229A1 true EP1200229A1 (fr) 2002-05-02

Family

ID=7913679

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00945808A Withdrawn EP1200229A1 (fr) 1999-07-06 2000-06-23 Dispositif pour desserrer plus facilement des pieces vissees

Country Status (3)

Country Link
EP (1) EP1200229A1 (fr)
DE (1) DE19930919C2 (fr)
WO (1) WO2001002137A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2552631Y (zh) * 2002-06-13 2003-05-28 苏州宝时得电动工具有限公司 具有盘状工具夹紧装置的电动工具机
DE102008009355B4 (de) 2008-02-14 2012-04-26 Weka Elektrowerkzeuge E.K. Werkzeugaufnahmespindel mit Entlastungsring

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136077A (en) * 1983-03-09 1984-09-12 Nord Lock Aktiebolag Nut and bolt locking arrangement
DE3613987A1 (de) * 1986-04-25 1987-10-29 Metabowerke Kg Vorrichtung zum loesbaren befestigen einer schleifscheibe
DE3644441A1 (de) * 1986-12-24 1988-07-07 Bosch Gmbh Robert Spanneinrichtung zum loesbaren befestigen eines werkzeuges, insbesondere einer scheibe
DE3832624A1 (de) * 1988-09-26 1990-04-05 Licentia Gmbh Schnellspanneinrichtung fuer auf der arbeitswelle eines elektrowerkzeugs angebrachte scheibenfoermige werkzeuge
BR9106833A (pt) * 1990-09-12 1993-07-13 Norman Leslie Matthews Prendedor tendo dispositivo de sujeicao para aperto e/ou afrouxamento manual
JP3244718B2 (ja) * 1991-05-22 2002-01-07 株式会社マキタ 回転工具における回転刃具の固止装置
JP3333627B2 (ja) * 1994-04-06 2002-10-15 株式会社マキタ 回転研削工具のツール固止装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0102137A1 *

Also Published As

Publication number Publication date
DE19930919A1 (de) 2001-01-18
WO2001002137A1 (fr) 2001-01-11
DE19930919C2 (de) 2002-04-25
WO2001002137B1 (fr) 2001-03-08

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