JPS6330161B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention consists of grip shapes made of plastic or other suitable material which are curved to cover the running surface of the tire and have grip shapes on the outside of their free ends, which are arranged at regular intervals from each other. fixed to the rim, comprising a plurality of non-slip arms swingable or fixed about an axis extending radially and parallel to the pivot axis (axle) of the rim; The present invention relates to an anti-slip device for wheels with pneumatic tires, in particular on ice and snow surfaces, consisting of a support disc.

In addition to snow chains, winter tires, so-called adhesive tires, are also used for driving cars uphill or downhill covered with snow in winter. Snow chains are often difficult to install on car tires and are designed to avoid damage to the running track, i.e. snow chains suffer from high wear when driving on dry tracks and do not allow high speeds. It is rarely used because snow chains must be removed on dry roads following ice-covered road sections. Especially on roads that suddenly become covered with ice.
In the case of icy surfaces, for example caused by drizzle falling on icy road surfaces, snow chains and sticky tires often cannot be used. Tires with spikes can also not always be used.

In addition to snow chains and sticky tires, driving aids are also known, but these are not substitutes for snow chains and sticky tires. These driving aids, which consist of clamps attached to the tires, serve only to get the vehicle out of mud or snow for short distances.

The object of the invention is to provide an anti-skid element of the type mentioned at the outset, which can always be provided on a motor vehicle wheel for mounting an anti-skid element with an anti-skid arm and which allows easy installation and removal of the anti-skid element. The object of the present invention is to provide a fixing device for an anti-slip device.
Furthermore, an anti-skid device should be provided which is always held on the vehicle wheel for mounting the anti-skid member with an anti-skid arm.

To solve this problem, according to the invention, a circular fixing disk with a plurality of openings for the rim screws is provided in order to fix the support disk with concentric openings to the rim. The fixed disk has at its center a circular boss having a smaller diameter than the diameter of the fixed disk, and the boss has
a plurality of annular protrusions each having a plurality of spaced apart annular protrusions each having a slide guideway extending conically and taperingly in a circumferential direction of the boss from the introduction opening in a circumferential direction of the boss, adjacent to and around the side edge thereof; a support disc which is secured by a clamping ring attached to the boss and has a non-slip arm and fits into the boss; the clamping ring has a circumferentially extending and conical shape; a locking web having a tapered portion and being introduced into the slide guideway of the boss to create a bayonet lock; and at least one leaf spring-like fastener on its inner wall surface. the fastener engages in a notch around the boss in the locking position of the clamping ring to the fixing disk and abuts a stopper arranged on the annular projection to prevent unintentional unlocking; An anti-slip device of the type mentioned at the outset has been proposed, which can be moved from a locked position to an unlocked position by means of an unlocking key.

With the fixing device constructed in this way, the installation of the anti-slip device, which consists of a support disc with a plurality of anti-slip arms, is easy and does not require any effort. Since the fixing device consisting of a fixing disc and a clamping ring remains attached to the rim, the clamping ring is removed from the fixing disc fixed to the rim in order to install the support disc with the anti-slip arm. All you have to do is This is followed by the attachment of the support disk to the boss of the fixed disk. With the subsequently mounted clamping ring, the support disc is arranged such that the support disc is fitted with play into the boss of the fixed disc and is held between the fixed disc and the clamping ring. Locked onto a fixed disc. Based on the bayonet lock between the fixed disc and the tightening ring,
The anti-slip device consisting of a support disc with anti-slip arms is held securely. Unlocking is effected by an unlocking key having two raised portions by which the leaf-spring fastener is moved from its locked position. The fixing disc with the boss and the attached clamping ring can always remain attached to the rim of the motor vehicle, and the actual anti-slip device is installed where required.

Further advantageous embodiments of the invention are apparent from the claims. Particularly advantageous in this case is the embodiment according to claim 4, in which the support disc with the anti-slip arm is fitted with play in the hub of the fixed disc. Due to the fact that the support disc is held on the fixed disc with a relatively large play, the support disc with the anti-skid arm must follow the rotational movement of the tire during operation of the anti-skid device. Therefore, the supporting disk can perform eccentric movements, since it does not have to be fixedly arranged on the rim. The support disc is held with play in the boss of the stationary disc, so that it can perform a pivoting movement adapted to the rotational movement of the tire.
In this way, it is ensured that the anti-slip arm of the anti-slip device always assumes a position in driving conditions, in which it abuts the side wall surface of the tire and covers the running surface.

Another advantageous embodiment of the invention provides that the anti-slip device comprises:
For fixing the support disc, the fixing disc is connected to the rim and has a lockable fitting for the support disc, the fixing disc being non-removably connected to the rim. It is characterized by being connected and forming one element of the wheel. Since the fixing disc and the clamping ring remain attached to the rim in this embodiment, the clamping ring must be removed from the fixing disc connected to the rim in order to install the support disc with the anti-slip arm. All you have to do is be done. This is followed by the attachment of the support disk to the boss of the fixed disk. The support disc is then secured by the fastening ring, such that the support disc fits with play into the boss of the fastening disc and is held between the fastening disc and the fastening ring. Locked onto the disk.

The features of the invention are illustrated in the drawings.

As shown in FIGS. 1 and 2, the anti-slip device 10 comprises a support disk 2 having a central aperture.
0, and a plurality of radially extending non-slip arms are fixed to the support disc, the non-slip arms are arranged at equal intervals from each other and are connected to the pivot axis (axle axis) of the rim. ), but a fixed arrangement of the anti-slip arm 40 is also possible.

The anti-slip device includes a tire 13 and is fixed to a wheel constituting a rim. Rim 1
1 includes brake parts not shown in the drawings. The running surface area of the tire 13 is designated by the reference numeral 14 and the outer surface of the tire by the reference numeral 15. (Figure 1).

The fixation of each non-slip arm 40 to the support disc 20 is carried out by means of a bolt-like or rivet-like connection means, so that the non-slip arm 40 can be attached to the support disc 20 so that a worn non-slip arm 40 can be replaced.
It is also possible to attach it removably to the body.
As shown in FIG. 2, the support disk 20 is provided with eight anti-slip arms 40. The number of anti-slip arms can be selected arbitrarily. However, there must be at least two anti-slip arms. All anti-slip arms are equiangularly spaced from each other.

Each non-slip arm 40 is
It is constructed of a spring-elastic material, for example spring steel, so that an elastic bending of the free end of the tire 13 into the area of the running surface 14 of the tire 13 is possible. The anti-slip arm 40 is an anti-slip device 1 for automobile wheels.
The free end of the anti-slip arm covers the tire running surface 14 after installation of the anti-skid arm. Non-slip arm 4 instead of spring steel
Other suitable materials may also be used to manufacture the 0. Thus, the anti-slip arm 40 may be constructed from a suitable plastic.

The anti-slip arm 40 has a strong grip on the snow or ice surface outwardly at its free end.
It has a grip shape so that the force is achievable. This grip shape can be configured as a spike, for example.

Anti-slip device 10 for automobile wheel rim 11
The fixing device for this consists of a fixing disk 50 and a tightening ring 150 (FIGS. 3 and 7).
According to another embodiment of the invention, the fixed disc 50 is an integral component of a motor vehicle wheel. in this case,
The wheel and the stationary disk form one rolled or cast part. Alternatively, the fixing disk 50 may be fixed to the rim 11 by the rim screw 18 in a non-removable manner.

The fixing disk 50 is provided with a plurality of openings 51 which serve for the passage of the rim screws 18. 1st
As shown in the figure, the rim screw 18 for fixing the fixed disk 50 has a bore with a female thread for engaging the tightening screw portion 85.
Thereby, the fixed disk 50 can be fixed to the rim 11.

The circular fixing disk 50 has in its center a boss 52 of circular cross section, which boss is designed as a cylindrical shape and is an integral component of the fixing disk 50. This boss 52 has a smaller diameter compared to the diameter of the fixed disk 50.

At its outer periphery, and also adjacent to the upper periphery 53, the boss 52 has a plurality of annular projections 55 arranged at equal distances from each other. In the embodiment shown in FIG. 3, the boss 52 of the fixed disk 50 is provided with four annular projections 55 that project laterally from the periphery of the boss.

A slide guideway 60 is configured below each annular protrusion 55 . The sliding guideway 60 is designed as a recess and has an introduction opening 56 from which the sliding guideway 60 is directed towards the end region, such that the introduction opening 56 extends into the end region 56a. It tapers conically so that it is chosen larger in comparison. As a result, the notch forming the slide guideway 60 extends in a wedge shape and is limited by the annular body 57 in a region adjacent to the fixed disk 50. The end region 56a of the sliding guideway 60 likewise has a limiting element in the form of a stop, although this is not absolutely necessary.

The annular body 57 formed on the outer periphery of the boss 52 is
At the same time, it constitutes an upper limiting member for the support disk 20 attached to the boss 52 of the fixed disk 50 (FIG. 3). A portion of each opening 51 is a boss 5 as a bore.
2, this annular body 57 is interrupted in the area of the opening 51 (FIG. 3).

All the slide guideways 60 are constructed and arranged below the annular protrusion 55 so that the introduction openings 56 thereof face the end region 56a at the back of the opening.

Each annular projection 55 is preferably provided in its upper region with a flattened portion 55a in order to facilitate the installation of the tightening ring 150.

The boss 52 of the fixing disk 50 serves to receive the support disk 20 with the anti-slip arm 40 of the anti-slip device 10 and to receive the clamping ring 150 .

Anti-slip device 10 attached to fixed disk 50
The support disk 20 is fixed by means of a tightening ring 150. This tightening ring 150 has an outer diameter slightly smaller than or equal to the diameter of the fixed disk 50, and its inner wall surface 150a
It has a plurality of locking webs 155, the number of which corresponds to the number of annular projections 55 or the number of sliding guideways 60 of the boss 52 of the fixed disk 50. This locking web 155 is constructed in such a way that it can be introduced into the sliding guideway 60 so that a bayonet-type locking between the clamping ring 150 and the boss 52 or the fixing disk 50 takes place. (Figure 7). As a result, since the locking web 155 is configured in a wedge shape, when the tightening ring 150 is attached to the fixed disk 50, each locking web 15
The conically tapered end of 5 points towards the introduction opening 56 of the cutout which constitutes the slide guideway 60 between the annular projection 55 and the annular body 57 and allows the clamping ring 150 to be When pivoted about the vertical central axis in the direction of the arrow
(Fig. and Fig. 7).

The locking web 155 of the clamping ring 150 can be mounted on the boss 52 of the fixed disc 50 so that the locking web 155 of the clamping ring 150 can be introduced into the slide guideway 60.
are two adjacent annular protrusions 5 of the fixed disk 50
It has a length equal to the spacing between 5 and 5. In this way, the locking web 155 is such that, at the mounting position of the tightening ring 150, the tightening ring 150 abuts on the annular body 57 and the locking web 155
5 can be passed between two annular projections 55 in each case until they can be introduced into a recess forming a sliding guideway 60.

In order to avoid spontaneous release of the clamping ring 150 from the boss 52 or from the fixing disk 50, the clamping ring 150 is provided with an additional restraining device. This restraining device is constructed as a leaf spring-like fastener in the form of a spring-elastic tongue, which is arranged in a cutout 156 in the inner wall surface 150a of the clamping ring 150. The arrangement and configuration of this leaf spring-like fastener 160 is such that the tightening ring 150 is attached to the boss 52 of the fixed disk 50.
When the leaf spring-like fastener 160 is attached to the top but is in the unlocked position, the annular protrusion 55 of the boss 52 causes the leaf spring-like fastener 160 to lock onto the inner wall surface 150a of the tightening ring 150.
It is made so that it is pressed into the notch 156 of. When the locking of the clamping ring 150 is effected by pivoting it, the leaf spring-like fastener 1
60 is a notch 1 formed around the boss 52
It is brought to 52 areas. Leaf spring-like fastener 16
0 tries to force itself from its notch 156 in the direction of arrow As long as it is in contact with the stopper 153 defining the notch 152 of the boss 52, it will be locked there. The free end of the leaf-spring catch 160, which engages the stop 153 in this cutout, therefore prevents the clamping ring 150 from being pivoted in a direction opposite to the locking direction of rotation and from being able to disengage from the boss 52. do.

The number of leaf spring-like fasteners 160 on the inner wall surface 150a of the tightening ring 150 can be selected arbitrarily. In the embodiment shown in FIG. 7, two leaf spring-like fasteners 160 are provided on the inner wall surface 150a of the tightening ring 150 at equal intervals from each other. At this time, the spacing between the notches 152 around the boss 52 of the fixed disk 50 matches the spacing between the leaf spring-like fasteners 160.

The leaf spring-like fastener 160 is integrally molded at the same time as the clamping ring 150 is manufactured. The clamping ring 150 is made of plastic with spring elasticity in a tongue-like design, which also applies to the leaf-spring fastener 160.

Instead of leaf spring catch 160, a differently configured locking device may also be used. For example, it is possible to use a radially movable and spring-loaded bolt that engages in a corresponding cutout around the boss 52 of the fixed disc 50; As long as the locking bolt has to be pulled back to its initial position so that the ring 150 can be removed from the fixing disk 50,
Appropriate actions must be taken to unlock the lock.

In order to be able to remove the clamping ring 150 from the fixed disk 50, it is necessary to press the leaf spring-like catch 160 from its locked position into its initial position in the cutout 156 of the inner wall surface 150a of the clamping ring 150. It is. For this purpose, an unlocking key 70, shown in FIGS. 8 and 9, is provided, which is arranged at one free end in two spaces apart from each other and is attached to a grip-like handle 71. It consists of a grip-like handle 71 having pressing tongues 72 and 73 that stand up almost perpendicularly to the grip. The distance between the two pressing tongue pieces 72 and 73 is the same as that of the pressing tongue piece 7.
2, 73 corresponds to the spacing of the opposing leaf spring-like fasteners 160 so that they can be introduced into the two cutouts 152 of the boss 52. For this purpose, according to FIG. 7, the two cutouts 152 of the boss 52 have an additional cutout 75 into which the two pressing tongues 72, 73 of the unlocking key 70 can be introduced.

When the pressing tongues 72 and 73 of the lock release key 70 are introduced into the notch 75 and the lock release key 70 is turned in the direction of arrow X2 (FIG. 7), the notch 152 of the boss 52 The two leaf spring-like fasteners 160 that have been brought in are pushed out from within this notch 152 and rotated by being pressed into the notch 156 of the inner wall surface 150a of the tightening ring 150. At this time, the leaf spring-like fastener 160 is held in the end region of the movement path of the two pressing tongues 72, 73 until it is removed from the stopper 76 against which the two pressing tongues 72, 73 come into contact. It is pressed into the notch 156. Pressing tongue piece 72,
73 is brought into contact with this stopper 76 and the lock release key 70 is further turned in the direction of arrow X2, the pressing tongues 72 and 73 interlock the tightening ring 150 and release the lock web
55 is further rotated, it is pulled out of the sliding guideway 60 of the fixed disc 50 until the locking web 155 is brought between the annular projections 55, in which position the tightening ring 150 52.

The tightening ring 150 can also be attached to the boss 52 using the unlocking key 70.
The pressing tongues 72 and 73 are introduced into the notch 75 and the arrow X of the lock release key 70 (FIG. 7)
When turning in the direction, the pressing tongues 72, 73
The locking web 155 is attached to the slide guideway 6.
This is done by interlocking the clamping ring 150 until it is brought into position 0 and a bayonet lock is produced. In order to interlock the tightening ring 150 with the pressing tongues 72 and 73 of the lock release key 70, the notch 75 is connected to a leaf spring-like fastener 160.
It has a stopper 78 in the fixed area (FIG. 7).

As FIG. 1 shows, the fixing disk 50 has a spacer ring 80 in the area of the rim screw opening 51, which is designed as an exchangeable adapter. Thus, different sized spacer rings 80 allow the fastening device to be adapted to different tire sizes.

The fixing of the anti-slip device 10 consisting of a support disc 20 with an anti-slip arm 40 to the rim 11 of the motor vehicle using a fixing device consisting of a fixing disc 50 and a tightening ring 150 After fixing the fixing disk 50 with the rim screw 18, the support disk of the anti-slip device 10 is attached to the boss 52 of the fixing disk 50.
It is done so that it can be attached to. Following this, the tightening ring 150 is installed in such a way that its locking web 155 is brought into the space between the annular projections 55 of the boss 52. after that,
The pressing tongues 72, 73 of the lock release key 70 are introduced into the notch 75 and the lock release key 70 is rotated in the direction of arrow X (FIG. 7), whereby the tightening ring 150 is the tightening ring 1
50 is rotated until the locking web 155 of the inner wall surface 150a is brought into the notch forming the slide guideway 60. At the same time, the leaf spring-like catch 160 is pivoted elastically into the recess 152 of the boss 52, so that the clamping ring 150 is locked against unintentional disengagement. By bringing the free end of the leaf spring-like catch 160 into the stop-like recess 153, a positive locking is ensured. This stopper notch 153 is configured by cutting the end portion sharply, and the free end of the leaf spring-like fastener 160 has a substantially wedge-shaped shape, so that the leaf spring-like fastener 160 can be cut free of its free end. Cut the end of this stopper notch 1
53, it is guaranteed that it cannot be suppressed outwardly.

In this way, the anti-slip device 10 includes the fixing disk 50 and the tightening ring 1 such that the anti-slip arm 40 of the anti-slip device 10 covers the tire running surface.
It is held on the rim 11 of the motor vehicle wheel by a fastening device consisting of 50.

To remove the anti-slip device 10, use the notch 75 again.
This is done with the aid of the unlocking key 70, into which the pressing tongues 72, 73 are introduced. By turning the lock release key 70, the leaf spring-like fastener 16 is released.
0 is pressed and rotated from the locked position to the initial position within the notch 156 of the inner wall surface 150a of the tightening ring 150. At the same time, tightening ring 1
The tightening ring 150 is pivoted until the locking web 155 of the boss 52 is disengaged from the slide guideway 60 of the boss 52. At this time, the tightening ring 150 can be removed. After that, the fixed disk 50
The support disc 2 of the anti-slip device 10 from the boss 52 of
0 is removed. If the anti-slip device 10 is not used but a fixing device is provided, only the tightening ring 150 is provided on the fixing disk 50 so that the anti-slip device 10 can be attached whenever necessary. is installed and locked.

The support disk 20 of the anti-slip device 10 is provided with an opening concentric with the fixed disk 50 so that the support disk 20 can be attached to the boss 52 of the fixed disk 50. However, the diameter of this concentric opening is limited to the diameter of the support disc 2 of the anti-slip device 10 held on the boss 52.
0 is larger than the diameter of the boss 52 so that it can perform eccentric movement. In this way, the anti-skid arm 40 covering the tire running surface can be adapted to the rotational movement of the tire rolling with respect to the support disc 20. Furthermore, the diameter of the concentric opening of the support disk 20 is selected such that the support disk 20 can be brought onto the annular body 57 of the boss 52. The upward protection of the support disk 20 is provided by a tightening ring 150 which covers it intermittently, and the protection to the rim is provided by the fixed disk 50 itself.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of an automobile wheel equipped with an anti-slip arm that covers the running surface of a tire of an anti-slip device; Fig. 2 is a partial plan view of a support disk supporting the anti-slip arm of the anti-slip device; 3 is a plan view of the fixing disk with the boss of the fixing device for the anti-slip device, FIG. 4 is a vertical section through the fixing disk, FIG. 5 is a side view of the fixing disk, and FIG. Figure 7 is a plan view of the locking ring of the locking device for the anti-slip device; Figure 8 is a plan view of the unlocking key; Figure 9 is the unlocking key. FIG. 10... anti-slip device, 11... rim, 13...
... Tire, 14 ... Running surface area, 15 ... Outer surface, 18 ... Rim screw, 20 ... Support disk, 40
...Anti-slip arm, 50...Fixed disc, 51...
...Opening, 52...Boss, 53...Edge, 55...
Annular protrusion, 56... Introduction opening, 57... Annular body, 60... Slide guideway, 70... Lock release key, 71... Handle, 72, 73...
Pressing tongue piece, 75, 152, 156...notch part, 7
6, 78, 153... Stopper, 80... Spacer ring, 85... Tightening screw, 150... Tightening ring, 155... Locking web, 160... Leaf spring-like fastener.

Claims (1)

[Scope of Claims] 1. A tire made of plastic or other suitable material, curved to cover the running surface of the tire, and having grip shapes on the outside of its free end, extending radially at equal intervals from each other. consisting of a support disc securable to the rim and provided with a plurality of non-slip arms pivotable or fixed about an axis extending parallel to the pivot axis of the rim; In an anti-slip device for wheels with pneumatic tires, in particular on ice and snow surfaces, a rim screw 18 is used for fixing the supporting disc 20 with an opening concentric with the fixing disc 50 to the rim 11. A circular fixing disk 50 having a plurality of openings 51 for the fixing disk is provided, the fixing disk having a circular boss 52 at its center and having a smaller diameter compared to the diameter of the fixing disk 50. a plurality of annular protrusions, the boss having a plurality of annular protrusions adjacent to and around a side edge 53 thereof and having a sliding guideway 60 extending conically taperingly in the circumferential direction of the boss from the introduction opening 56; The tightening ring 15 is arranged such that the parts 55 are spaced apart from each other and is attached to the boss 52.
0 and has a support disc 20 having a non-slip arm 40 and engaging a boss 52, a clamping ring 150 extending circumferentially and tapering conically. The locking web 155 has a locking web 155 that is introduced into the slide guideway 60 of the boss 52 to create a bayonet type lock, and at least one leaf spring-like fastener 160 is provided on the inner wall surface 150a of the locking web 155.
In the locking position of the fastening ring 150 to the fixing disk 50, the fastener forms a notch 15 around the boss 52.
2 and located on the annular projection 55 to prevent unintentional unlocking.
53, and is movable from a lock position to an unlock position using a lock release key 70. 2. Around the boss 52 of the fixed disk 50, four integrally molded annular protrusions 55 having introduction openings 56 are provided at equal intervals. The anti-slip device according to claim 1, characterized in that a number of locking webs 155 corresponding to the number of portions 55 are integrally molded and are arranged at equal intervals. 3 The tightening ring 150 is attached to its inner wall surface 150a,
It has two leaf spring-like fasteners 160 arranged equidistantly from each other, the leaf spring-like fasteners being mounted on the fixing disk 50 with a number corresponding to the number of fasteners 160 in the locked position. A clamping ring 15 is provided in the cutout 152 which is rotatable by its own elasticity and for unlocking when external pressure is applied.
3. The anti-slip device according to claim 1, wherein the anti-slip device can be pulled back by being pressed into the notch 156 of the inner wall surface 150a. 4. The supporting disc 20 with the anti-slip arm 40 is fitted with play to the boss 52 of the stationary disc 50 in order to perform an eccentric rotational movement. The anti-slip device according to any one of 3 to 3. 5. An unlocking key 70 for unlocking the leaf spring-like fastener 160 is provided at one free end thereof with two pressing tongues 72 spaced apart from each other;
73, the pressing tongues are arranged so as to stand up perpendicularly to the grip-like handle 71, and their mutual spacings are opposite to each other. The anti-slip device according to any one of claims 1 to 4, characterized in that the spacing between the tools 160 corresponds to the spacing between the tools 160. 6 Rim screw 18 for fixing the fixed disc 50
6. Anti-slip device according to claim 1, characterized in that the anti-slip device has a bore with an internal thread for receiving a tightening screw (85). 7. The length of the locking web 155 of the clamping ring 150 substantially corresponds to the distance between two adjacent annular projections 55 of the boss 52 of the fixed disk 50. range 1 to 6
The anti-slip device according to any of the above. 8 The anti-slip device has a fixing disk 50 connected to the rim 11 and provided with a lockable fitting for fixing the support disk 20, said fixing disk 50 being non-removable. 8. Anti-slip device according to claim 1, characterized in that it is connectable to the rim (11) and forms an element of a wheel. 9 made of plastic or other suitable material, curved to cover the running surface of the tire and having grip shapes on the outside of its free end, extending radially at equal intervals from each other and extending along the pivot axis of the rim; Consisting of a support disc attachable to the rim, with a plurality of non-slip arms pivotable or fixed around an axis extending parallel to the ice surface and In an anti-slip device for wheels with pneumatic tires on snow surfaces, a plurality of openings for rim screws 18 are provided for fixing to the rim 11 a support disk 20 with openings concentric with the fixing disk 50. A circular fixing disk 50 having a diameter 51 is provided, the fixing disk having at its center a boss 52 which is circular and has a smaller diameter compared to the diameter of the fixing disk 50; The boss has a plurality of spaced apart annular protrusions 55 each having a slide guideway 60 extending conically taperingly in the circumferential direction of the boss from the introduction opening 56 around the periphery thereof adjacent to the side edge 53 thereof. Tightening ring 15 placed open and attached to boss 52
0 and has a support disc 20 having a non-slip arm 40 and fitting into a boss 52, a clamping ring 150 extending circumferentially and tapering conically. The locking web 155 has a locking web 155 that is introduced into the slide guideway 60 of the boss 52 to create a bayonet type lock, and at least one leaf spring-like fastener 160 is provided on the inner wall surface 150a of the locking web 155.
In the locking position of the fastening ring 150 to the fixing disk 50, the fastener forms a notch 15 around the boss 52.
2 and located on the annular projection 55 to prevent unintentional unlocking.
53 and is movable from the locked position to the unlocked position by the unlocking key 70, and the fixed disc 50 is in the area of the rim screw opening 51 on the wall facing away from the boss 52.
Anti-slip device, characterized in that it has a replaceable adapter configured as a spacer ring 80.