Bicycle safety device.

p0001The invention relates to a safety device for bicycles according to the preamble of claim 1.

p0002Since time immemorial, it is known and customary to secure bikes against theft and unauthorized use by means of bolted at the rear fork pressure locks, which is held in an open state of the key in the lock and can only be removed when the for locking provided locking bolt between the spokes of the rear wheel is suppressed. Since these pressure locks can be removed easily unscrewed or otherwise, possibly violently, they offer very little security.

p0003involved In view of the sharp increase in recent years the number of road users and also used for sporting activities bicycles and the concomitant increase in the number of bicycle thefts, there is an urgent need, the safety of bicycles against unauthorized use, but in particular to increase against theft , Instead and / or in addition to the conventional pressure locks therefore, the use of safety, ironing, Schwenkbügel-, Stahlkabel- and chain locks, such as those described in DE Offenlegungsschriften 28 48 390, 31 15 534 32 03 509 32 06 709, 32 12 281, 33 08 977 and 33 20 310 describes wide acceptance.

p0004With locks of this type, the quick access of thieves are indeed difficult, a sufficient safeguard against theft but also they do not provide. This is mainly because they are freely accessible from the outside substantially and therefore can be easily removed with appropriate tools or their closing action can be canceled. So even relatively stable ironing, Stahlkabel- and chain locks, for example, are largely eliminates any problems by means of a bolt cutter.

p0005DE-OS 32 11 704 also already a solution has been known in which the closing and locking mechanism of the bicycle lock is integrated into the bottom bracket of the bicycle in order to impede the forcible removal of the anti-theft and unauthorized use of a bicycle at least. Although this device has a greater security than the devices mentioned above, but it has other hand, a number of serious disadvantages.

p0006One disadvantage, for example, proves the use of a number of individual elements of relatively small dimensions, with the result that these as precision components to speaking parts are vulnerable and therefore susceptible to interference against both pollution and especially wear.

p0007Another major drawback is the fact that the bottom bracket is widened to one side and thus is the ergonomic requirements not just for the use of a bicycle. This one-sided broadening of the bottom bracket necessarily leads to uneven muscle strain, This should be noted in particular during long trips and when driving in more or less hilly or mountainous terrain very. Even if one wanted this one-sided development of the bottom bracket to offset the fact that this or the bottom bracket would widened or extended also to the other side to a corresponding extent, would result in addition to the disadvantage of an additional expenditure of material, the disadvantage of a disproportionate width distance between the two pedals, which would be disadvantageous in ergometric respects. Finally, with this institution the in the unlocked state up to about 5 cm from the frame structure protruding locking cylinder represents a considerable risk of accidents because the driver or the driver can with parts of garments, for example, a leg, caught and overthrow it.

p0008The same applies to the from FR-PS 344 996 known solution, in which the bottom bracket of a accommodated next to the tube frame of the bicycle with a bead-like thickening and in the area of ​​thickening at two diametrically opposite locations with recesses for engagement in a housing locking pin is provided.

p0009It is relatively easy, either with the present in this individual parts or to remove the entire housing of this case the lid and then remove the items from the housing and thus release the lock without impaired by the use of the bicycle in any way is, thus, the security device then does not meet their intended and intended purpose.

p0010To make the forcible removal of the anti-theft and subsequent use of the bicycle is impossible or at least difficult so that this is not possible without damaging the bicycle, is provided in the DE-OS 35 41 169, the closing and locking mechanism in the frame of the bicycle fitted. Thus, the ergonomic disadvantages or accident hazards caused by the protruding locking cylinder of the DE-OS 32 11 704 are indeed avoided, but can not satisfy this solution for several reasons. This is characterized in particular by the fact that a large number of loosely coupled parts is provided, which represent a complex to manufacture and assemble and easily susceptible to failure in its operation mechanism. The for the engagement of the locking rod is provided in the bottom bracket hole represents a substantial weakening of the bottom bracket, which fall may result particularly in larger effort, such as an ascent to a distortion or even a fraction of the bottom bracket and so may not only the locking mechanism but the whole bike can be inoperable.

p0011Furthermore, sheared in this known device with appropriate force due to the shear forces occurring in the region of the bore at the periphery of the bottom bracket axle, the relatively thin locking rod and thus the locking mechanism be disabled. In addition to acting on the locking bar significant forces that can bend or even break the lock rod due to the relatively large distance between the leadership of the locking bar and the bottom bracket.

p0012The DE Offenlegungsschriften 32 11 704 and 35 41 169 should be noted that both solutions, as far as recognizable, without pretension of the locking elements or work and, accordingly, do not allow user-friendly closure. To reach the closed position, must namely the crank and bottom bracket are first brought awkward in such a position at two facilities in which the for the engagement of the locking element is provided in the bottom bracket spindle bore, groove, notch or the like the locking element facing very accurately, because the latter can only be brought by the closing operation is engaged and locked it.

p0013From DE-GM 90 15 395 it is also known to attach the bicycle frame, a guide sleeve, at the upper end a cylinder lock is arranged, the locking cylinder through means of a by-trained in the bicycle frame and the guide sleeve openings insertable key about an axis of the guide sleeve is rotatable vertical axis and the lock cylinder having an adjusting member which axially displaceably arranged with a in the guide sleeve, in the wells of the bottom bracket shaft insertable locking bolt is connected.

p0014In this device, an insertion of the locking pin in the recesses of the bottom bracket is also only possible if they face each other exactly. Again the crank thus must be mostly long reciprocated to a corresponding position is reached. Much more serious, however, is the disadvantage that the bottom bracket engages in the locked state at a relatively long lever arm of the locking pin and therefore the risk that he given a corresponding power transmission by correspondingly powerful actuation of the pedal crank bend order departure of the lock or even break, especially as the guiding the locking pin in the guide sleeve has a little stability. Finally, it is in this known device also not possible to use a commercially available known cylinder lock, but only one connected with additional effort specifically for the intended use trained and prepared cylinder lock.

p0015From US-PS 20 55 149 a housed in the bicycle frame locking means is finally known in which the tretlagerseitige lock characterized, in that an operated via a gear and provided in the region of the gear wheel with a tooth bar in the blocking position before the one of two mutually exactly opposite formed on the bottom bracket above sets cams. It is in the locked position but the possibility of the pedal axis by almost 180 ° reciprocate, so that relatively large shear and lever forces can be transmitted via the crank with appropriate force, the and due to the lack of a sufficiently stable guidance of the locking rod to the bending / can or lead to the cancel of the cam, whereby the function of the locking device would at least be questioned.

p0016Lastly also this known device that it is here a relatively easy to remove, because easily accessible from the outside, blocking device acts.

p0017The invention has as its object, bicycles effectively protect against theft by means of a locking mechanism which can only be overcome with very considerable technical difficulties, but it is also simple in its construction and operation, as well as mechanically reliable and trouble-free functioning. This object is achieved with a device according to claim. 1 Useful embodiments of the invention are described in the dependent claims.

p0018The inventive construction makes it possible to put together all the parts of the locking device with the exception of bearing the bulbous thickening and the wells bottom bracket to a finished pre-assembled unit and then to arrange targeted as such in the tube of the bicycle frame at the designated location and secure, whether by welding, riveting or the. like. the individual parts of the device are characterized by their simple structure and their relatively high robustness so that it can be assembled in a simple manner and are little wear and susceptible to failure. In the arrangement of the locking device in the seat tube of the bicycle frame, it is suitable in particular also for retrofitting for already in use bicycles, the only small required opening in the tube of the bicycle frame for the required insertion of the key in the event of actuation, no significant weakening of the frame tube to the sequence Has.

p0019The invention is shown in the drawing in exemplary embodiments and will be explained below with reference to this. Show it<dl id="dl0001"><dt>figure 1</dt><dd>in a section and partly in section an embodiment of the antitheft device according to the invention,</dd><dt>figure 2</dt><dd>in view and in an axial section or a partial section two different embodiments of the bottom bracket,</dd><dt>figure 3</dt><dd>in view, in section and partial section some items the antitheft of Figure 1,</dd><dt>figure 4</dt><dd>in view and in a partial section a variant of the locking piece of Figure 3,</dd><dt>figure 5</dt><dd>in a cutout and partially in section a variant of the locking device of Figure 1 in a somewhat larger scale in front and side view and top view,</dd><dt>figure 6</dt><dd>in a cutout and partially in section, another embodiment of the antitheft device according to the invention,</dd><dt>figure 7</dt><dd>in three sectional views of a further embodiment for the actuation of the locking device and the actuating lever of Figure 7 in two views,</dd><dt>figure 8</dt><dd>in section and in some enlarged scale a further embodiment of the locking device,</dd><dt>figure 9</dt><dd>in various sectional views of other embodiments and a detail,</dd><dt>figure 10</dt><dd>in front and side view and partly in section a further training opportunity and items to</dd><dt>figure 11</dt><dd>in the same way another embodiment, </dd><dt>figure 12</dt><dd>in the same way a still further embodiment,</dd><dt>figure 13</dt><dd>in a cutout in front and side view and partly in section and on an enlarged scale an embodiment of an outer cover of the frame keyhole against moisture and dirt and</dd><dt>figure 14</dt><dd>in a corresponding manner, a variant of FIG 14th</dd></dl>

p0020In the embodiment of Figure 1, the bottom bracket 1 is provided with the branch joints 1a, 1b and 1c, in which the down tube 1a ', the seat tube 1b' and the rear fork tube 1c 'attached, in particular welded. In bottom bracket 1 the bottom bracket shaft 2 is arranged and rotatably supported by bearings, not shown, in particular ball bearings. The bottom bracket shaft 2 is provided with two diametrically diametrically opposed recesses. 3

p0021In the bottom bracket end of the seat post tube 1b 'is arranged and with the seat tube 1b, except for the bottom bracket 2 all parts of the locking device receiving the guide sleeve 4' firmly connected, for example by spot welding, rivets or the like. In the guide sleeve 4, the locking piece 5 is axially movably arranged in the tubular part 5a is of the axially movable locking pin 6 is located. Between the end remote from the bottom bracket end of the locking bolt 6 and the collar-shaped portion 5b of the locking piece 5, the compression spring 7 is arranged. Another compression spring 8 is accommodated between the collar-shaped portion 5b of the locking piece 5 and the ring inside, paragraph 4a of the guide sleeve. 4 At the upper end of the locking piece 5 of a side view of a U-profile-shaped flange 5c is formed, in which the eccentric 10 connected to the lock cylinder 9a of the known and commercially available recessed cylinder lock 9 engages. The lower end of the locking bolt 6 is formed as a truncated cone 6a and in accordance therewith, the two recesses 3 of the pedal bearing shaft 2 are formed. In the locking bolt 6 of the locking pin 11 is furthermore mounted, which is guided in the slot 12 of the tubular portion 5a of the locking piece 5 and the locking pin 6 from falling out of the locking piece prevents 5th

p0022Finally, 'the aligned openings 1b and the guide sleeve 4' 'and 4b for the insertion of the key 13 into the intended opening of the lock cylinder 9 at the corresponding point of the saddle support tube 1b formed. To protect the entire locking device against moisture and dirt can in the same seat tube 1b 'of produced particular plastic or rubber plug 14 arranged, in particular clamped, this can of course also have a different shape from that shown.

p0023Two embodiments of the bottom bracket 2 shows the Figure 2. In both the above shown Tretlagerhohlwelle and in the Tretlagervollwelle shown below, the bead-shaped thickening 15 is provided in the center thereof, wherein in the thickening in the upper Tretlagerhohlwelle at two diametrically opposite points per slot 16 and in the thickening of the lower Tretlagervollwelle axial slots 17 are provided in a corresponding manner. Of course, the oblong holes 16 and the slots 17 could be provided at each of the other Tretlagerwellentyp instead. Two embodiments have in common that the outer diameter of the bottom bracket bearing shaft 2 17 is not or only weakened slightly in the region of the oblong holes 16 or slots, that the reason the elongated holes 16 and slots 17 is at least approximately flush with the outer diameter of the cylindrical part of the spindle cranksets.

p0024In this connection it is noted that the embodiment of the elongated hole 16 offers the additional advantage that, in the locked device is an extension of the pedal bearing shaft is reliably prevented. The axial extent of the slots as well as the slots can be chosen more or less large. As a rule, a longitudinal extension which carries 2 account of the naturally existing small axial play of the bottom bracket is sufficient. The design of the long holes and slots in the circumferential direction of the bottom bracket is advantageously carried out so that the locking bolt 6 engages with its truncated cone 6a in locking position without play in the slot or the slot, wherein the conical shape of engaging in the recess portion of the locking bolt 6 avoids sticking of the cone and the easy release of the device is ensured by corresponding actuation of the lock cylinder 9a by means of the key. 13

p0025Instead of elongated holes or slots come for both Tretlagerwellentypen corresponding design of the locking pin 6 and its guide in the locking piece 5 and the guide sleeve 4, other cross-sectional shapes for the recess in the bottom bracket 2 into consideration, without thereby affecting the function is impaired, it being understood the axial play of the bottom bracket as well as a backlash-free as possible interaction between locking bolts and depression in the bottom bracket shaft circumferentially at locking position again to take appropriate account.

p0026The items the antitheft of Figure 1 shows the Figure 3. The guide sleeve 4 shown in front and in section in a side view, has the collar-shaped shoulder 4a, on which the compression spring is supported. 8 The upper end of the guide sleeve 4 is deposed twice stepped to accommodate the built-in cylinder lock 9 or the axially movable receiving the locking piece 5 with U-profilförmigem flange 5c and for fixing the built-in cylinder lock 9 with the threaded holes 18 and for actuating the lock cylinder 9a provided by the key 13 with the hole 4b.

p0027The built-in cylinder lock 9 in which it is a per se known and commercially available security lock, has for attachment to the guide sleeve 4, the two holes 19 and on the U-shaped flange 5c of the locking piece 5 side facing the eccentric 10 on , which is fixedly connected to the lock cylinder 9a, so that 10 in upon actuation, ie rotation of the lock cylinder 9a is rotated by means of the key 13 in the same manner of the eccentric 10, while in accordance with the rotation of the lock cylinder 9a and the eccentric on the latter by its engagement the U-shaped flange 5c, the locking piece 5 is axially displaced, in such a way that the locking bolt is shifted 6 via the compression spring 7 with simultaneous voltage of the further pressure spring 8 in the direction of the bead-shaped thickening 15 of the bottom bracket 2 out. Unless this the bottom bracket shaft 2 with their recesses 3 the locking bolt 6 faces exactly the bolt 6 with its conical end 6a pushed without significant tension of the compression spring 7 in the recess 3, thus causing the desired Tretlagerverriegelung. Otherwise, the locking bolt is pressed with its conical end 6 with simultaneous tension of the compression spring 7 against the bead-shaped thickening 15 of the bottom bracket 2 and are closed, under relaxation of the compression spring 7 when the bottom bracket shaft 2 is rotated until one of its recesses 3 the end 6a of the locking bolt 6 opposite stands and the bolt 6 now penetrate into the recess and can cause the lock. To increase security, it is advisable to make the locking pin 6 of a tough grade of steel and perform a surface hardening.

p0028All shown in Figure 3 items, except for the bottom bracket 2 are pre-assembled prior to their introduction into the bicycle frame to form a unit and then incorporated as such in the bicycle frame and od on the guide sleeve 4 by welding, brazing, riveting in this. Like. Close the bottom bracket is fixed to a designated position corresponding to. To make the assembly of the individual parts as easy as possible, these parts are matched appropriately. Thus, the width of the U-shaped flange is, for example 5c of the locking piece 5 to be smaller than the distance of the threaded holes 18 in the guide sleeve 4 and the holes 19 in the recessed cylinder lock 9, and further, for example, of the eccentric 10 and the central web of the U profile-shaped flange 5c formed so that the last held attaching and tightening the recessed cylinder lock 9 can easily take place in the guide sleeve. 4

p0029When assembling the parts in the individual process so that first the compression spring 7 and thereafter, the locking bolt 6 is inserted in the tubular portion 5a of the locking piece 5 and then introduced through the slot 12 therethrough, the retaining pin 11 in the locking bolt 6 is screwed, for example, or pressed is becomes. The thus created unit is subsequently, after application of the further compression spring 8 on the tubular portion 5a of the locking piece 5 or introduction inserted into the guide sleeve 4 in the latter. Then the built-in cylinder lock is inserted with the eccentric 10 from the side in the guide sleeve 4 and the U-shaped flange 5c and laterally past bolted to the central web of the U-shaped flange 5c of the guide sleeve. 4 The axially movable locking the locking bolt 6 in the locking piece 5 can be performed in many other ways, of course, instead of slot 12 and pin 11th

p0030The fully assembled locking device is finally introduced into the frame, both the down tube 1a ', the seat tube 1b' and make the appropriate constructive measures with limitations also the chainstay tube 1c come what principle 'into consideration. but are preferably the down tube 1a 'and the seat tube 1b' into account, namely both equally in the case of mounting the anti-theft device in the manufacture of the wheel, the latter also in the case of a retrofit of a bicycle with the anti-theft device according to the invention. In the case of the incorporation of anti-theft device in the new production of the bicycle can be provided in the seat tube 1b 'purpose-oriented introduction of the assembly unit to form the chamfer 4c at the lower end of the guide sleeve 4 and form the so corresponding part of the bottom bracket in a corresponding manner. The introduction of the completely assembled locking means is in each case so that the opening 4b of the guide sleeve 4 with the opening 1b '' and a corresponding not shown opening in the bottom pipe 1a 'is precisely aligned, after which it is then fixed in the frame tube.

p0031A variant of the locking piece 5 of Figures 1 and 3 shows the Figure 4, with the difference being that there is provided only a rectangular flange 5d in the embodiment of Figure 4, instead of the U-shaped flange 5c of Figures 1 and 3, ie, a flange in which the upper transverse web fails t. While in the U-shaped flange 10 of Figures 1 and 3 5c due to the engagement of the eccentric in the U-profile whose reciprocating rotation by actuation of the lock cylinder 9a by means of the key 13, an axial displacement of the locking piece 5 effected in both directions and the further compression spring 8 role is therefore of little significance in terms of ease of releasing the lock, takes place in the embodiment of figure 4 is an axial displacement of the locking piece 5 with locking bolt 6 when turning the eccentric 10 only in the locking direction, but not the opposite rotation of the eccentric 10 in the sense of unlocking the device. The task is to bring about the release, here comes rather exclusively the further compression spring 8 to which is in contrast to that of Figures 1 and 3 accordingly formed with a sufficiently large spring force. In any case, the spring force of another spring 8 as well as that of the compression spring 7 is always sized only as big as this is necessary to fulfill the intended function.

p0032From the embodiments of Figures 1 to 4, the solution shown in Figure 5 differs in that the locking cylinder of schematically illustrated recessed cylinder lock 9 instead of an eccentric gear 20 is connected and the collar-shaped portion 5b of the locking piece 5 with the gear 20 cooperating rack formed 21st Otherwise, the embodiments of Figures 1 and 5 are identical in terms of their training and particular operation substantially.

p0033In the embodiment of Figure 6, the collar-shaped portion is provided 5b of the locking piece 5 at its top with the inclined plane 22, with 9 connected to the lock cylinder 9a of the built-in cylinder lock and actuated by rotation of the barrel 9a by a key not shown eccentric 10 cooperates. This embodiment in principle corresponds to the design of the locking piece 5 in the embodiment shown in Figure 4, ie, the locking piece 5 with the locking bolt 6 and the compression spring 7 is 7 Although displaced by the rotational movement of the lock cylinder in tension of the pressure spring in the axial direction of the pedal bearing shaft 2 axially toward, however, takes place at an opposite rotational movement of the lock cylinder 9a and therefore the cam disc 10 in the sense of unlocking the anti-theft device is not necessarily one opposes directed axial resetting of the locking bolt 6 and locking piece 5, this is effected rather by the further compression spring 8, which must be dimensioned accordingly.

p00347 shows various views of further examples of an operative connection between the lock cylinder 9a of the recessed cylinder lock 9 and the locking piece 5 takes place with arranged in the tubular portion 5a of the locking piece 5, not shown compression spring 7, and with the locking bolt 6. The principle of the locking here in such that 9 of the eccentric connected with it 10 is operated with this rotatably attached lever 23 by rotation of the barrel 9a of the built-in cylinder lock, whereby it with its lower end in the formed on the top of the collar-shaped portion 5b of the locking piece 5 notch 24 engaged and the locking piece 5 moves upon rotation of the locking cylinder 9a with the key in the axial direction to the bottom bracket 2 out the compression spring 7 is tensioned and the locking bolt 6 urged toward bottom bracket 2, so that the locking bolt 6 with its truncated cone 6a in a the recesses 3 of the bottom bracket 2 engages as soon as these confront each other exactly. Here too, by oppositely directed rotation of the lock cylinder and the parts connected to it does not necessarily rather turn causes a release, this is the appropriately dimensioned further compression spring. 8 As shown, the lever 23 is formed as an angle lever, in which it 25 for applying having a curvature on the provided on the eccentric pin 10 26th

p0035The embodiment of Figure 8 substantially corresponds to that of Figure 1, however, the tension spring is in place the further compression spring 8 in the guide sleeve 4 arranged 27 with its upper end in the between the collar-shaped portion 5b and to the tubular member 5c of the locking piece 5 formed cam 28 formed slot 29 and held by its lower end in the slot formed between the inside and the paragraph 4a formed in the guide sleeve 4 cams 30 31. The standing in the illustrated "open position" of the locking device under tension spring 27 strives to move the locking piece 5 with locking bolt 6 in the closing direction axially, but is prevented from doing so by the below the upper cross member 5e of the U-shaped flange 5c engaging eccentric 10th When closing the anti-theft device by rotation of the eccentric 10 via the lock cylinder 9a by the key of the lock the locking piece 5 is displaced axially towards the bottom bracket shaft with a locking pin 6, wherein the tension spring 27 is relaxed in a corresponding manner, when the locking pin 6 in one of the wells of the bottom bracket engages and thus the bottom bracket axle is locked. A canceling the locking is carried out necessarily when the eccentric 10 is returned by actuating the lock cylinder 9a by means of the key in the position shown in Figure 8, at the same time, the tension spring 27 is set again under prestress. This ensures that drill out by unauthorized persons, the lock in the case of the experiment, an existing locking the bottom bracket is not canceled, it is possible rather only by pressing the lock cylinder 9a by means of the appropriate key.

p0036Also in the embodiment of Figures 9, 9a, 9b and 9c is an embodiment in which, except for the bottom bracket shaft, each element of a closed assembly, which is suitable for subsequent installation and for installation as part of the production and the based on the same principle as the embodiment of FIG. 1

p0037On the lock cylinder 9a of the fixed appropriately in the guide sleeve 4 built-in cylinder lock 9, the bevel gear 37 is here instead of an eccentric vertically arranged and fixed, that is with the bevel gear 39 of the control piece 38 in engagement, which at its periphery, the annular groove 40 and on its underside the provided trapezoidal screw thread part 41 has, with which the control piece 38 is engaged with the provided with a paßgleichen internally threaded collar-shaped part 5b of the locking piece 5, it being understood that a different thread form may be provided instead of a trapezoidal thread. The control member 38 is in the guide sleeve 4 circumferentially rotatable, could be provided by means of the annular projection 42, in lieu of this, for example, a snap ring or a corresponding number of circumferentially arranged distributed lugs or pins arranged but secured against axial displacement.

p0038When rotated to the through holes 1b '' and 4b introduced not shown keys of the lock cylinder 9a, in a corresponding manner, the vertical bevel gear 37 is rotated, the 39, the control member 38 is rotated in turn about standing with him engaged bevel gear threaded portion 41st To prevent the possibility the locking piece 5 rotates, whereby a relative axial displacement between the control piece 38 and locking piece 5 would prevent the locking piece 5 according to FIG 10b by the trained at the periphery of his collar-shaped portion 5b longitudinal groove 43 and the engaging in this in the guide sleeve 4 fixedly mounted pin 44, which is for example, could be a screw, and according to FIG 10c through the formed on the outside of the locking piece 5 surface 45 and cooperating therewith in the guide sleeve 4 fixed spline 46 at twisting in the circumferential direction prevents, without, however, the axial mobility of the locking piece 5 is impaired. By turning the control piece 38, an axial displacement of the locking piece of the truncated cone 6a is according to the slope of its threaded portion 41 5 effected towards the bottom bracket, which in the event that none of the wells of the bottom bracket is located opposite the locking pins 6, initially with simultaneous voltage the compression spring 7 abuts against the bead-like thickening of the bottom bracket and then while turning the crank axle bores into one of the pits under relaxation of the compression spring 7 and thus locks the bottom bracket. Accordingly, the locking piece in the opposite direction axially displaced in the reverse rotation of the control piece 38 and thereby unlocked by pulling the locking bolt 6 from the depression of the bottom bracket, the bottom bracket again.

p0039The embodiment of Figure 10 essentially corresponds to that of Figure 10, except that the control piece 38 and the collar-shaped with this cooperating part are also different from 5b of the locking piece. 5 Thus, the control piece 38 on its lower side instead of the threaded part the helical inclined plane 47 and the upper end of the locking piece 5, the to precisely fitting helical inclined plane 48 as a counterpart on, as can be seen in particular from the perspective representation of these two parts. The mode of action results from a comparison of the left figure shows the device in the open state, and the right figure shows the device in locking position. In order to reduce friction weight and the control piece 38 can be pierced axially and 5 formed in a hollow, the upper end of the locking piece. Likewise, the surfaces can be 47 and 48 is provided with a plastic coating to reduce friction and the associated sluggishness.

p0040Another way of forming the control piece 38 and the collar-shaped portion 5b of the locking piece 5 as the counterpart shown in FIG 11th Here, the control piece 38 are formed on its bottom and the collar-shaped portion 5b of the locking piece 5 at its top as mating cams 49 and 50 respectively. To illustrate the control piece 38 is shown in a section from which it can be seen that it is provided for weight reduction with a through central axial opening 51st Likewise, the cam-shaped upper end of the locking piece is shown in a cut-out for clarity. Finally, Figure 11 shows the left the locking device in the open position and the right in lock position. Otherwise, the embodiment of this figure regard to actuation and also function with the embodiments shown in Figures 10 and 11 matches. Again, 49 and 50 are provided with a plastic coating to reduce friction and the associated binding the surfaces.

p0041A further variant for the formation of the control piece 38 and the collar-shaped portion 5b of the locking piece 5 is shown in FIG 12, namely the left in the open position and the right in lock position. The control member 38 and the collar-shaped portion 5b are formed here with the inclined planes 52 and 53rd With respect to the operation of this embodiment is the same with those according to figures 9, 10 and 11. FIG.

p0042Besides the one shown in Figure 1 plug 14 that can be provided, of course, in all other illustrated embodiments, it has proven expedient that the bicycle frame, whether in the seat tube 1b 'or the down tube 1a', provided for the passage of the key opening 1b '' to protect by means of a cover against weather influences and contamination. One possible embodiment for showing the figure 13, wherein in the opening 1b '' in the seat tube 1b 'the 54 is provided Plastic surrounding this collar, the flap 55 with exactly 54 fitting into the recess 60 of the cuff conical thickening 61 and having the right into the frame opening 1b '' matching and collapsible inside cylindrical projection 56 and the operating tab 57th For required insertion of the key, the flap 55 is raised by means of the tab 57 and pivoted about its one end, to the keyhole 1b '' is sufficiently clear and the key can be inserted. After removing the key, the door is pushed back into its original position, with the projection 56 in the keyhole 1b '' pushing and the flap holds in its closed position. Under certain circumstances, it proves to be advantageous to the sleeve 54, at least along its upper and lower edges 58 and 59 to be bonded to the frame to the collar 54 to her opening 60 with respect to the keyhole 1b '' in the right place fix and prevent between frame 1b 'and sleeve 54 moisture or dirt can penetrate. Likewise also be provided in an advantageous manner to carry out the sleeve 54 in a signal color to give a visual indication of an additional safety and to achieve a psychological Abschrekkungswirkung.

p0043Instead of a flap, the slide 62 is provided in another embodiment of the sleeve 54 according to FIG 14th The sleeve 54 has exactly aligned with the keyhole 1b '' bore 63 and also, the slider 62, the same size hole 64. The slide 62 is guided by means of dovetailed lateral undercuts 66 in the cuff 54 against falling out and backed up and is held by the compression spring 65 in the closed position in which the keyhole 1b '' and the sleeve bore 63 covered by the slider 62, ie are closed. For insertion of the key, if necessary, the slider 62 is 65 moved so far against the pressure of the spring until the slide bore 64 with the keyhole 1b '' and the sleeve bore 63 is congruent, so that now the key can be inserted. After removing the key, the slider 62 returns under the pressure of the spring 65 back to its previous closing position.

p0044It is expedient in principle, in all embodiments of the antitheft device of the present invention to provide the grooves in the pedal bearing shaft so that a vertical Tretkurbelstellung is achieved in the event of locking, whereby only a relatively small force can be applied to the crank in the normal position of the bicycle.

p0045In all embodiments shown, in which by operating the locking cylinder 9a necessarily also an axial displacement of the locking piece 5 in one and the other direction is effected by means of the key 13 in one direction or the other about the adjusting member, in place of the compression spring 8, a tension spring 27 are provided in order to impede unauthorized picked the lock or to make it impossible.

p0046In all shown in the exemplary embodiments as well as lying within the scope of the invention further imaginable embodiment possibilities, the rotation of the adjusting member and the control piece of the one part and the axial displacement of the locking piece or the locking bolt, on the other hand, matched to each other, whereby the force required to achieve the proper locking axial displacement from case to case can be achieved by a more or less large rotation of example 90, 180 or even 360 °, what then of course an appropriate and suitable platform security cylinder lock is used.

p0047The arrangement of the built-in security cylinder lock is expediently so that the key must be introduced for its operation in the plane of the bicycle frame and towards the rear. This prevents that in case of stuck "accidental omission Insert" the key of the user of the bicycle with his clothes on key and thereby put at risk. This risk is of course not when about by a Federausdrücker, especially on such a key, it is ensured that the key is stuck in no case in the lock. In this case, a lateral insertion of the key is harmless.

p0048The anti-theft device according to the invention can also be applied in conjunction with an additional known chain, cable, strap fuse or the like, in the case of an attempted theft of the surprising effect can arise that a potential thief after the departure of the known external and conspicuous castle must state that the Fahrradtretlager is blocked and can not proceed with the bike. Likewise, the anti-theft device according to the invention could be applied instead or in addition, also in conjunction with optical and / or acoustic anti-theft devices.