Caster comprising a wheel having an axis of rotation and a tread

Abstract

A caster (1) comprising a wheel (2) having an axis of rotation (y) and a tread (15), wherein a locking element (34) and a locking jaw (35) are provided and the locking element (34) can be moved between a release position and an engagement position in which the locking jaw acts on the tread (15) in order to lock the wheel (2), and wherein, in the engagement position, the locking jaw (35) can further be moved by the rotational movement of the wheel (2) itself, while bearing against the fixing element (34), from an initial blocking position into a final blocking position, wherein the locking element (34) has a supporting surface (47) for the locking jaw (35) and the locking jaw (35) has a bearing surface (58) which cooperates with the supporting surface (47).

Description

Description Roller with a rotating axis and a running surface balance bike field of technology

[0001] The invention relates to a castor, in particular a steering castor, with a running wheel having a rotational axis and a running surface, wherein a locking element with a locking jaw is provided and the locking element is movable between a release position and an engaged position, in which the locking jaw acts on the running surface to lock the running wheel, wherein the locking jaw in the engaged position is movable from a rotational movement of the running wheel itself, with support on the locking element, from an initial blocking position into an end blocking position, wherein moreover the locking jaw is wedge-shaped in a cross-section in which the rotational axis is represented as a point, and the locking element has a support surface for the locking jaw and the locking jaw has a support surface that interacts with the support surface.

[0002] The invention further relates to a castor, in particular a steering castor, with a running wheel having a rotational axis and a running surface, wherein a locking element with a locking jaw is provided and the locking element is movable between a release position and an engaged position in which the locking jaw acts on the running surface to lock the running wheel, wherein the locking element is further designed as a first lever part of a toggle lever arrangement and is connected to a second lever part of the toggle lever arrangement in a toggle joint, wherein in addition an acting element moves the locking jaw into the engaged position by moving the toggle lever arrangement from a first, more strongly angled position to a second, less strongly angled position. State of the art

[0003] Casters of the type in question are known, particularly in a design as a swivel caster. The caster has a running wheel, preferably rotatably mounted in a fork. In the case of a swivel caster, the running wheel is pivotable about a vertical axis. The fork can, for example, have a mounting pin by means of which the caster can be arranged on a frame. The running wheel can be rotationally locked with respect to a geometric running wheel rotation axis via the locking jaw of the locking element, for which purpose the wheel can be brought into an engagement position that interacts with the running surface of the running wheel. This can result in a wedge-shaped action of the locking jaw between the locking element and the running surface of the running wheel. In this regard, reference is made, for example, to EP 3 572239 A1 (US 10 857833 B2) and also to EP 0 364 732 A1.From DE 3908 313 Ul as well as from DE 7924594 Ul, rollers are known in which the locking jaw can be moved from the release position to the engagement position via a toggle lever arrangement.

[0004] In view of the above-described prior art, the present invention is concerned with the object of further developing a roller of the type in question in an advantageous manner, in particular with regard to the action of the locking jaw on the running wheel, further in particular on the running surface of the running wheel.

[0005] A possible solution to the problem is provided according to a first inventive idea in a roller in which the support surface is designed to be elongated in a circumferential direction of the impeller and that the support surface is movable in the circumferential direction along the support surface during a movement from the blocking initial position to the blocking end position, so that the support surface as a whole in the bio- end blocking position is offset in the circumferential direction to the support surface and to its position in the initial blocking position.

[0006] This advantageously results in an elongated support surface that runs essentially along the tread curvature. The support surface does not necessarily follow the curved profile of the tread and, accordingly, does not necessarily run concentrically with the tread. The support surface can be straight along its longitudinal extent; preferably, it is curved. The support surface can also have a curvature in its longitudinal extent that differs from the curvature of the tread. Furthermore, the curvature of the support surface—relative to the directly opposite curvature areas of the support surface and the tread—can be selected to be opposite to the curvature of the tread.This can advantageously result in a wedge-like design of the area between the locking element and the running surface to be filled by the locking jaw, simply through the selected arrangement and design of the support surface of the locking element.

[0007] In the case of a curved profile of the support surface, as is also preferred, a geometric center, to which a line of curvature of the support surface in the longitudinal extension, which at least partially corresponds to a circular line, refers in the cross-section described above, can be located outside the locking element, possibly even outside the roller as a whole. The support jaw is further preferably displaceable around this geometric axis in the circumferential direction of the wheel.

[0008] The extension of the support surface in the circumferential direction of the running surface may be approximately two or three hundredths of the can correspond to the circumferential length of the tread, for example at least one hundredth to four hundredths or more, further up to, for example, five hundredths or one tenth of the circumferential length of the tread.

[0009] For example, the extension dimension can be about two or three to 5 mm or more, or even up to 7 mm or more.

[0010] Over this extension dimension, the support surface of the locking jaw can move along the support surface of the locking element or the locking jaw can move relative to the locking element from the initial blocking position to the final blocking position and vice versa.

[0011] In the final blocking position, the support surface of the locking jaw is offset from the support surface of the locking element, compared to the initial blocking position, along the alignment of the support surface. The offset can correspond to a maximum of the extension of the support surface.

[0012] In a further embodiment, both the support surface and the support surface can be repeated when viewed in the circumferential direction of the running surface and can accordingly be provided several times if necessary, for example in the case of a relatively small extension of a few millimeters (for example up to 4 or 5 mm) of a support surface when viewed in the circumferential direction.

[0013] It can also be provided that the dimension of the support surface of the locking jaw, viewed in the circumferential direction of the running surface of the impeller, is less than or equal to the extension dimension of the support surface of the locking element.

[0014] According to a further inventive concept, the object can also be achieved in the case of a roller with a locking element as part of a toggle lever arrangement in that the second position can only be maintained under the constant action of force from the action element.

[0015] This advantageously results in the possibility of a preferably automatic return of the toggle lever assembly and thus of the locking jaw from the second position toward the first position as soon as the force applied by the action element is removed. Accordingly, stable self-locking of the toggle lever assembly is not achieved without a sustained force. Preferably, there is no active return displacement of the toggle lever elements, nor of the locking jaw, for example, by controlled dragging, toward the home position preferably defined by the first position.

[0016] In order to cancel the locking or engaged position of the locking jaw, the proposed design only requires the removal of the force acting on the toggle lever arrangement, which further advantageously allows a simplified construction of the roller as a whole to be achieved.

[0017] The features of the above-described independent claims are significant both individually and in any combination with each other, whereby further features of an independent claim can be combined with the features of another independent claim or with the features can be combined with features of several independent claims, and also with only individual features of one or more of the further independent claims.

[0018] For example, a roller can be provided in which the support surface is elongated in a circumferential direction of the running wheel, wherein the support surface is movable in the circumferential direction during a movement from the initial blocking position to the final blocking position along the support surface, so that the support surface as a whole in the final blocking position is offset in the circumferential direction to the support surface and to its position in the initial blocking position, and wherein furthermore the locking element is designed as a first lever part of a toggle lever arrangement and is connected to a second lever part of the toggle lever arrangement in a toggle joint,Furthermore, an action element moves the locking jaw into the engaged position by moving the toggle lever arrangement from a first more angled position to a second less angled position, and the second position can only be maintained under the constant force of the action element.

[0019] Further features of the invention are explained below, also in the description of the figures, often in their preferred association with the subject matter of claim 1 and / or the further independent claim or with features of further claims. However, they may also be important in association with only individual features of claim 1 and / or the further independent claim or the respective further claim, or each may be important independently.

[0020] According to a possible further development, the locking element can have a holding opening elongated in the circumferential direction of the impeller for the Locking jaw. The mounting opening can be designed in a slot-like manner, wherein a flank bordering this slot can also simultaneously form the support surface. Accordingly, the slot-like mounting opening can preferably extend longitudinally in the direction of extension of the support surface as a whole.

[0021] The holder opening can, as is also preferred, simultaneously offer a travel limitation with regard to the displaceability of the locking jaw relative to the locking element.

[0022] The locking jaw itself can have a double wedge-shaped cross-section, with a greatest thickness at the opposite end regions in the circumferential direction of the impeller. This results in a locking jaw in the cross-section that, viewed in the direction of extension of the support surface, has a thinner thickness in a central region than in the end regions. This can be achieved by an at least approximately coaxial profile of the jaw surface facing the running surface—relative to the running surface of the impeller—optionally in conjunction with a support surface that curves in the opposite direction in the cross-section.

[0023] The thicknesses in the end areas can be selected to be the same and correspond, for example, to approximately 1.1 to 2 times, further, for example, to approximately 1.2 to 1.5 times the thickness in the middle area of ​​the locking jaw.

[0024] The support surface of the locking jaw can, as is also preferred, be elongated in the circumferential direction of the impeller. It can be further defined by an upper side of one or more of one or more ribs and / or a top formed by valleys or valleys formed between two elevations, possibly the said ridges.

[0025] In this case, the support surface can also be composed of several surfaces separated from one another in the circumferential direction of the impeller and / or transversely to the circumferential direction.

[0026] It is further preferred that the locking jaw has a mounting projection that projects transversely to its extension in the circumferential direction of the impeller. This allows it to be received in an associated mounting recess of the locking element. The receptacle is preferably provided so as to be movable in the circumferential direction of the impeller.

[0027] Further preferably, two mounting projections are provided that are opposite one another transversely to the circumferential direction of the impeller. Such a mounting projection can also be composed of several individual projections, viewed in the circumferential direction of the impeller.

[0028] Furthermore, a retaining projection is preferably elongated in the circumferential direction of the impeller. An elongated configuration preferably means that an extension in the circumferential direction is greater than an extension of the retaining projection transverse to the circumferential direction.

[0029] According to a further embodiment, the locking jaw can also have (at least) one reinforcing part alone or additionally, which interacts with the support surface. The reinforcing part can contribute to increased stability of the adjustment device and / or to improved force transmission overall. For interaction with the support surface, It should be provided that the reinforcement part engages in the holder opening of the locking element and is also guided through the opening if necessary.

[0030] Furthermore, the reinforcement part can be made of a different material than the material of the locking jaw. Preferably, a harder material is selected for the reinforcement part compared to the material of the locking jaw, particularly for improved force transmission and to increase abrasion resistance. Furthermore, for example, if the locking jaw (and preferably also the locking element) is made of a plastic material, the reinforcement part can be made of a metal material.

[0031] The reinforcement part can, for example, be designed as an entire axis, as is also preferred, at least in the areas that interact with the elongated support opening(s) or with the support surface(s). These axis-shaped sections (or even the entire reinforcement part) can, as is also preferred, have a circular cross-sectional design.

[0032] The locking jaw can be secured to the locking element by means of the reinforcement part. Preferably, this can be achieved by corresponding engagement of the reinforcement part in the slot-shaped mounting opening, whereby, in addition to the preferably captive mounting, a travel limitation with regard to the displaceability of the locking jaw relative to the locking element can be achieved.

[0033] In a further preferred embodiment, two reinforcement parts are provided, spaced apart from one another in the circumferential direction of the impeller. The two reinforcement parts can engage in mounting openings that are also spaced apart from one another in the circumferential direction of the impeller or, alternatively, tiv - into a holder opening that accommodates both reinforcement parts at the same time and is designed to be elongated accordingly.

[0034] The proposed design promotes the wedge effect in the engaged position. Appropriate design measures preferably ensure that the locking element, together with the locking jaw, is initially guided perpendicular to the contact surface of the impeller onto the running surface and into the engaged position. In this engaged position, the locking jaw can engage with the running surface using any teeth on the jaw surface that may be provided. If the impeller, which is essentially blocked in this way, is loaded in one direction of rotation, the interaction of the locking jaw and the running surface results in the locking jaw being dragged along the support surface. This, due to the opposing curved paths of the support surface and the jaw surface of the locking jaw, results in the locking jaw becoming wedged between the running surface and the locking element. The impeller becomes increasingly blocked.A limitation of this drag movement is given by the selected thickness of the locking jaw in the end areas, as well as by a possible stop of an axle-shaped reinforcing part at the facing end of the holder opening.

[0035] When the load on the locking element is removed, the locking jaw can be relocated to a neutral center position along the support surface. This can be achieved by a spring that applies appropriate pressure to the locking jaw.

[0036] With regard to a roller with a locking element as part of a toggle lever arrangement, it is further proposed that the lever parts each have a longitudinal axis and that the longitudinal axes enclose an angle of less than 180° to each other in the second position. In this second In the position in which the engagement position is reached, the levers of the toggle lever arrangement are displaced from the first position beyond the action element only to such an extent that an extended position of the lever parts or even an overextended position of the lever parts (extended dead center position) is not reached. Thus, in the first position of the lever parts relative to one another (release position), an angle of, for example, approximately 95° to approximately 130° can be assumed, and in the second position (engagement position), an angle of, for example, approximately 115° to approximately 145° or up to approximately 160°.

[0037] The action element can, as is also preferred, act on the toggle lever arrangement in the region of the knee joint that pivotably connects the lever parts. By applying a corresponding force during a displacement of the action element, the lever parts connected in the knee joint are spread apart from one another, increasing the included angle.

[0038] The action element can be designed as a separate element from the knee joint assembly. For example, the action element can be an element generally provided in a caster of the type in question, possibly also serving to perform additional functions.

[0039] Thus, the introduction element can further be a plunger which can be moved linearly - preferably along an axis which is vertical during normal operation - or, for example, a switching plunger guided in a mounting pin, via which, for example, in addition to the rotational blocking of the impeller or alternatively, a pivotal blocking of the steering roller about the vertical axis described above can be carried out.

[0040] In one possible embodiment, the action element can be movable between a contact position, in particular at the knee joint, and a distance position relative to the toggle lever assembly. Accordingly, the toggle lever assembly can be completely relieved of load in the release position.

[0041] Preferably, the displacement of the knee lever assembly into the engagement position of the locking jaw takes place counter to the restoring force of a restoring spring acting on the knee lever assembly.

[0042] Even in a toggle lever arrangement as described above, the locking jaw, which is preferably provided in an articulated manner on the lever-like locking element, is guided linearly in such a way that it can be displaced towards the running surface of the wheel in a manner substantially perpendicular to the running surface.

[0043] The ranges, value ranges, or multiple ranges specified above and below also include all intermediate values ​​with regard to the disclosure, in particular in 1 / 10 steps of the respective dimension, and may therefore also be dimensionless. For example, the specification 115° to 145° also includes the disclosure of 115.1° to 145°, 115° to 144.9°, 115.1° to 144.9°, etc., while the disclosure of 3 to 5 mm also includes the disclosure of 3.1 to 5 mm, 3 to 4.9 mm, 3.1 to 4.9 mm, etc. This disclosure can serve, on the one hand, to delimit a stated range boundary from below and / or above, but alternatively or additionally, also to disclose one or more singular values ​​from a respectively specified range.

[0044] The invention is explained below with reference to the accompanying drawings, which, however, only represent exemplary embodiments. A part that only is explained in relation to one of the embodiments and is not replaced by another part in a further embodiment due to the special feature highlighted there, is thus also described for this further embodiment as a possible existing part. Short description of the drawings

[0045] The drawing shows: Fig. 1 shows a roller in exploded perspective view, relating to a first embodiment; Fig. 2 shows the roller of the first embodiment in a partially sectioned perspective view; Fig. 3 shows the area III in Fig. 1 in an exploded perspective view, relating to a locking assembly of the roller of the first embodiment; Fig. 4 shows the section through plane IV in Fig. 1; Fig. 5 shows the section VV in Fig. 2, relating to a release position of the roller; Fig. 6 is a sectional view according to Fig. 5, but relating to a pivot blocking position; Fig. 7 is a further sectional view according to Fig. 5, relating to a position in total locking; Fig. 8 shows the area VIII in Fig. 7 in a sectional view offset perpendicular to the plane of representation, relating to an initial blocking position of a locking jaw of the locking assembly; Fig. 8a is a schematic representation of the wedge action of the locking jaw in a position according to Fig. 8; Fig. 9 is a view essentially corresponding to Fig. 8, but relating to a blocking end position; Fig. 9a is a representation essentially corresponding to Fig. 8a, but with the position according to Fig. 9; Fig. 10 is a further illustration substantially corresponding to Fig. 8, relating to a further blocking end position; Fig. 10a is a further schematic representation substantially corresponding to Fig. 8a, relating to the position according to Fig. 10; Fig. 11 a locking element of the locking assembly in a side view; Fig. 12 the locking element in a plan view; Fig. 13 the locking element in a perspective individual view; Fig. 14 the locking jaw of the locking assembly in a front view; Fig. 15 the locking jaw in a side view; Fig. 16 the locking jaw in a perspective individual view; Fig. 17 shows a lever part of the locking assembly in a perspective view; Fig. 18 shows a partially sectioned perspective view according to Fig. 2, relating to a roller in a second embodiment; Fig. 19 shows an exploded perspective view of a locking assembly of the roller of the second embodiment according to Fig. 3; Fig. 20 shows a sectional view of the area XX in Fig. 18, relating to a release position of the roller; Fig. 21 is a view essentially corresponding to Fig. 20, but relating to a position in total locking; Fig. 22 shows the section through the plane XXII in Fig. 18; Fig. 23 shows a locking jaw of the locking assembly of the second embodiment in a front view; Fig. 24 the locking jaw in a side view; Fig. 25 shows the section along the line XXV-XXV in Fig. 24; Fig. 26 the locking jaw of the second embodiment in a perspective individual view; Fig. 27 shows a second lever part of the locking assembly of the second embodiment in a side view; Fig. 28 the second lever part in plan view; Fig. 29 the second lever part in perspective individual view; Fig. 30 shows a locking element designed as a first lever part of the locking assembly of the second embodiment in a perspective individual view; Fig. 31 is a sectional view substantially corresponding to Fig. 20, but relating to a third embodiment; Fig. 32 is a view substantially corresponding to Figure 5 relating to a fourth embodiment of the locking element and the locking jaw; Fig. 33 shows the fourth embodiment in a representation according to Fig. 8, relating to a blocking initial position; Fig. 33a is a view corresponding to Fig. 8a, but relating to the fourth embodiment; Fig. 34 is a representation essentially corresponding to Fig. 33, but relating to a blocking end position; Fig. 34a is a representation essentially corresponding to Fig. 33a, but concerning the position according to Fig. 34; Fig. 35 is a further illustration essentially corresponding to Figure 33. Position relating to a further blocking end position; Fig. 35a shows a further representation essentially corresponding to Figure 33a, but relating to the position according to Figure 35; Fig. 36 the locking element of the locking assembly of the fourth embodiment in a side view; Fig. 37 the locking element of the fourth embodiment in plan view; Fig. 38 the locking element of the fourth embodiment in a bottom view; Fig. 39 the locking element of the fourth embodiment in a perspective individual view; Fig. 40 the locking jaw of the locking assembly of the fourth embodiment in a front view; Fig. 41 the locking jaw of the fourth embodiment in a side view; Fig. 42 the locking jaw of the fourth embodiment in plan view; Fig. 43 the locking jaw of the fourth embodiment in a bottom view; Fig. 44 the locking jaw of the fourth embodiment with an assignable spring in a perspective view; Fig. 45 a lever part of the locking assembly in a perspective individual view; Fig. 46 the locking assembly of the fourth embodiment in plan view; Fig. 47 shows the section through the locking assembly of the fourth embodiment according to the line XLVII - XLVII in Fig. 46, and; Fig. 48 the locking assembly of the fourth embodiment in a perspective view. Description of the embodiments

[0046] Shown and described, initially with reference to Figs. 1 and 2, is a roller 1 which is preferably designed in the manner of a steering roller in the embodiments shown.

[0047] The roller 1 essentially comprises a wheel 2 with a running surface 15 having a circumferential direction U and a fork 3, from which a cylindrically designed mounting pin 4 extends. The mounting pin 4 surrounds a geometric pivot axis x in a pivotable design with respect to a steering roller. The mounting pin 4 projects further with reference to the running wheel 2 in the normal state of use of the running roller 1 vertically upwards.

[0048] The fork 3 can, as also shown, be formed essentially from two fork shell parts 5, 6, wherein each fork shell part 5, 6 carries a fork leg 7.

[0049] The fork shell parts 5, 6 of the fork 3, with their fork legs 7, which preferably substantially coincide in the direction of a rotational axis y of the running wheel 2, grip the running wheel 2 mounted in the preferably provided fork cavity 8. An axle can be used to mount the running wheel 2, which passes centrally through the running wheel 2 and is preferably held at each end on the fork legs 7. The resulting geometric rotational axis y of the running wheel 2 preferably extends substantially transversely to the pivot axis x and thus, during normal use of the roller 1, substantially in a horizontal plane.

[0050] The illustrated caster 1 can be positioned, for example, on a hospital bed, a transfer carriage, or the like. It can be secured in the usual way using the mounting pin 4.

[0051] In the mounting pin 4, a switching cam 10 can be provided in the area of ​​an upwardly pointing free end, which is pivotally arranged about an actuating axis a. In this case, the actuating axis a can extend essentially at a right angle in the case of a design as a swivel caster. In the case of a design as a non-swivelling caster, also called a fixed caster, the pivot axis x corresponds to a vertical axis of the mounting pin. Where reference is made above and below to a pivot axis, this always also applies to a non-swivelling design as the The term "vertical axis" is to be understood as meaning the vertical axis. For rotational drive of the switching cam 10, the switching cam 10 may have a centrally arranged non-circular coupling opening 11, which may be hexagonal in the illustrated embodiment and through which a switching lever shaft (not shown) may pass for actuation.

[0052] Referring, for example, to the illustration in Fig. 5, a switching tappet 12 can be provided below the switching cam 10, via which a pivot locking device 13 and / or a wheel locking device 14 can be selectively actuated or released.

[0053] The switching plunger 12 is preferably aligned around the pivot axis x in the mounting pin 4 and is preferably displaceable vertically along the pivot axis x in a rotationally secured manner. For this purpose, the mounting pin 4 can have a reduced-diameter groove 16, also preferably aligned around the pivot axis x, which can optionally be adapted in cross-section to the switching plunger 12 for guidance.

[0054] As shown in Fig. 5, for example, the free end of the switching plunger 12 formed between the opening of the gear 16 and the switching cam 10 can be connected, for example, by screwing, to a cam part 17. The cam part 17 can preferably have a pot-like shape with a more preferably circular cross-section, wherein an enlarged-diameter region can be formed as an annular collar 18 at the end facing away from the switching plunger 12. Furthermore, the cam part 17 of the switching plunger 12 is guided within the mounting pin 4, based on the illustrations, preferably vertically along the pivot axis x.

[0055] Furthermore, the section of the cam part 17 that is reduced in diameter compared to the annular collar 18 can be surrounded by a first return spring 19, wherein one end of the first return spring 19 can be supported on the underside of the annular collar 18. The other, opposite spring end can be supported on an edge of the gear 16 that is fixed relative to the cam part 17. Thus, it can be provided that the switching tappet 12 is spring-loaded in the direction of the switching cam 10 by means of the first return spring 19. Furthermore, as is also preferred, the end face of the annular collar 18 that faces the switching cam 10 can have a central formation in the form of a counter-cam 20.

[0056] The switching tappet 12 interacts with the preferably provided counter cam 20 with the facing control surface 21 of the switching cam 10, which control surface 21 can further comprise two control recesses 22 and 23 arranged one behind the other in the circumferential direction of the switching cam 10 and of different depths with respect to the radial distance from the actuating axis a.

[0057] The switching cam 10 is limited in its pivoting mobility in the circumferential direction of the control surface 21 by a stop. For this purpose, as also shown, a stop projection 24 on the mounting pin side can engage in a correspondingly provided circumferential groove 25 of the switching cam 10. As can be seen, for example, from the illustration in Fig. 5, the circumferential groove 25 is provided substantially opposite the control recesses 22 and 23 with respect to the actuating axis a, wherein the circumferential groove 25 extending in the circumferential direction can further extend over an angular range of approximately 90°.

[0058] The switching tappet 12 extends in the direction of the impeller 2 preferably in the direction of the fork cavity 8 or into it. cavity 8 preferably surrounds a cross-sectionally circular formation of the switching plunger 12, which formation can be larger in diameter than an upper region of the switching plunger 12. The formation can take on the function of a detent plate 26, which, in a design as a swivel roller, can be formed on the switching plunger 12 transversely to the swivel axis x.

[0059] The locking plate 26 can have locking formations 27 on its plate surface facing the switching cam 10. In a so-called fixed roller position, as assumed, for example, in Fig. 6, in which fixed roller position the fork 3 with the wheel 2 can preferably only assume two positions offset by 180° relative to the mounting pin 4, these locking formations 27 can be pressed flat against the underside of a directional locking part 28 due to the spring force of the first return springs 19. The directional locking part 28 can in particular be fixed to the fork 3, further for example in a region in which the fork 3 as a whole is held via a bearing 29 on the mounting pin 4 and is pivotally movable relative to the latter about the pivot axis x.

[0060] The locking plate 26 with its locking formations 27, the direction-locking part 28 and a rotation-blocking part 30, which will be described further below, are essentially part of the pivot-locking device 13.

[0061] The fixed roller position can be achieved by rotating the switching cam 10 into a position of interaction of the counter cam 20 with the control recess 23, or another equivalent configuration (see Fig. 6). The fixed roller position can be adjusted relative to the neutral position shown in Fig. 5, in which the counter cam 20 engages the further control recess 22, due to the given spring force applied via the first return adjusting spring 19 with reference to the figures causes the cam part 17 and the switching plunger 12 and thus also the locking plate 26 to be lifted into the cooperative position with the direction-determining part 28.

[0062] On the underside of the locking plate 26 facing away from the locking formations 27, the switching plunger 12 can further have rotation-blocking projections 31. These can, for example, extend coaxially to the pivot axis x in the circumferential direction of the locking plate 26.

[0063] From the locking plate 26, a preferably circular, more preferably cylindrical extension 32 can extend from the switching plunger 12, viewed in the direction of the impeller 2, which extension 32 is of reduced diameter compared to the locking plate 26. This extension 32, in turn, can be guided in or engage with a centrally arranged passage opening of the rotation-blocking part 30 arranged around the pivot axis x. The rotation-blocking part 30, located between the impeller 2 and the locking plate 26 in the fork cavity 8, can be held in a rotationally fixed manner with the fork 3, just like the direction-locking part 28.

[0064] The rotation-blocking part 30 can have blocking receptacles 9 adapted to the geometry of the rotation-blocking projections 31. Preferably, the rotation-blocking part 30 is supported on the fork side by spring elements acting essentially in the direction of the pivot axis x.

[0065] Due to the interaction of rotation-blocking projections 31 of the locking plate 26 and blocking receptacles 9 in the rotation-blocking part 30, the roller 1 can be fixed in different pivoting positions about the pivot axis x when designed as a swivel roller. For this purpose, the switching cam 10 can be moved into a position about its actuating axis a. pivoting, in which the counter cam 20, as shown in Fig. 7, engages the control surface 21 of the switching cam 10, which extends radially outward in the circumferential direction. The counter cam 20 can be moved downwards together with the switching tappet 12 against the force of the first return spring 19, with reference to the illustrations. The rotation-blocking projections 31 can engage in the associated blocking receptacles 9 to prevent pivoting.

[0066] At the same time, and as is also preferred, a rotational locking of the running wheel 2 can also be achieved in this position. The running wheel locking device 14 serves this purpose. In contrast to the illustrations described, the running wheel locking device 14, described in more detail below, can also be used alone, i.e., possibly without a possible pivoting locking of the running roller 1 about the pivot axis x.For example, in one possible embodiment, the roller 1, as already noted, can be designed as a fixed roller, i.e. it has no possibility of assuming a fixed roller position (as is preferred in the case of the design as a swivel roller), for which purpose the switching cam 10 can, for example, only have a pronounced control recess 22 for defining the neutral position and from this neutral position the switching cam 10 can only be rotated in one direction in order to reach a second switching position in which the running wheel locking device 14 is activated.

[0067] Figs. 1 to 17 show a first embodiment of such a wheel locking device 14, Figs. 18 to 30 show a second embodiment and Fig. 31 shows a combination of the two first embodiments as a third embodiment.

[0068] The wheel locking device 14 initially has a locking assembly 33 with a holding part 38, a locking element 34 and a locking jaw 35, a lever part 36 and a second return spring 37. This locking assembly 33 can advantageously be pre-assembled and inserted into the fork 3. The mounting part 38, which essentially holds the other listed components, is preferably arranged in the fork 3 in a rotationally fixed manner with respect to the pivot axis x.

[0069] Referring first to the first embodiment, the lever part 36 is pivotally mounted on the support part 38. For this purpose, an axle 39, for example, accommodated at each end of the support part 38, can serve, about whose geometric pivot axis b, which preferably runs parallel to the rotational axis y of the impeller 2, the lever part 36 can pivot.

[0070] The end of the lever part 38 facing away from the end receiving the axis 39 finds, for example using axle pins 41, a likewise pivotable receptacle in the locking element 34, for example in slotted receptacles 40 of the locking element 34. The relevant geometric pivot axis c runs in parallel alignment to the previously described pivot axis b.

[0071] The locking element 34 can have two guide walls 42 spaced apart from one another in the direction of the pivot axis c. These are optionally connected to one another, preferably rigidly, via a core section 43 also having the aforementioned slotted receptacles 40.

[0072] On the outside of the guide walls 42, one or two guide parts, preferably two guide ribs 44 each, can be formed, which are spaced apart from one another and have a support part 38 preferably molded-on opposite, for example designed as a counter rib 45. This essentially provides a linear guide for the locking element 34 on the holding part 38. The direction of movement r between a release position shown in Figs. 5 and 6 and an engagement position shown in Fig. 7 preferably runs at an angle a of approximately 30 to 60°, further approximately 45°, to the pivot axis x. As a result, and also due to the selected arrangement of the holding part 38 in the fork 3, it is possible to feed the locking element 34 together with the locking jaw 35 arranged thereon essentially in a direction perpendicular to the running surface 15 of the running wheel 2.

[0073] Like the locking element 34, the locking jaw 35 is preferably also made of a plastic material, for example manufactured using a plastic injection molding process.

[0074] To secure the locking jaw 35 to the locking element 34, mounting openings, for example elongated slot-like mounting openings 46, can be provided in the side walls 42 of the locking element 34. As is also preferred, two mounting openings 46 can be provided for each side wall 42, spaced apart from one another in the longitudinal direction of a mounting opening 46 or in the circumferential direction U of the impeller 2.

[0075] With reference to a cross section in which the rotational axis y of the impeller 2 is represented as a point, further for example in a cross section according to Fig. 8, facing away from the running surface 15 of the impeller 2, support surfaces 47 are formed in the mounting openings 46 of a side wall 42, which support surfaces extend together along an imaginary curvature line k. This curvature line k runs, with reference to the cross-sectional representation, in a direction opposite to the curvature of the running surface 15. In this case, the Curvature lines k and the tread 15 have at least approximately equal radii. In a preferred embodiment, the curvature line k has a radius that can correspond to approximately 0.8 to 1.2 times the tread radius.

[0076] Further preferably, the boundary surface 48 of a support opening 46 opposite the respective support surface 47 extends along a line running coaxially to the curvature line k.

[0077] As also shown, the support openings 46 can be spaced apart from one another in the direction of extension of the curvature line k or in the circumferential direction U of the impeller 2 by a distance which essentially corresponds to the opening extension dimension of a support opening 46 in the same direction.

[0078] The mounting openings 46 of both side walls 42 are preferably congruent one above the other in a projection in the direction of the pivot axis c, correspondingly in a projection perpendicular to the viewing plane in Fig. 8.

[0079] A bottom side 49 of each side wall 42 facing the running surface 15 can also, as is also preferred, run along a line directed coaxially to the curvature line k.

[0080] The locking jaw 35 is accommodated between the side walls 42. The receiving arrangement is achieved via axle-shaped reinforcing parts 50. These reinforcing parts 50 are preferably made of a material which is different from the locking jaw material and preferably from the locking element material. made of a harder material. For example, these reinforcement parts 50 can be made of a metal material, as is also preferred.

[0081] Preferably, two axially shaped reinforcing parts 50 are provided which penetrate the side flanks 51 of the locking jaw 34 in the region of bore-like openings 52 and each engage with their ends in the previously described holding openings 46 of the locking element 34.

[0082] The diameter of the axially shaped reinforcing parts 50 is preferably adapted to both the diameter of the bore-like openings 52 and the radial distance (with respect to the curvature line k) between a support surface 47 and an opposite boundary surface 48 of a support opening 46.

[0083] The surface of a locking jaw-side reinforcing part 50 facing each support surface 47 forms a support surface 58 for the locking jaw 35 on the support surface 47 of the locking element 34. Due to a preferred circular cross-sectional design of the reinforcing part 48, a linear support on the support surface 47 preferably results.

[0084] The locking jaw 35 is accordingly mounted in the slot-shaped mounting openings 46 of the locking element 34 in a floating manner in the circumferential direction U and can move within the mounting openings 46 essentially transversely to the direction of movement r of the locking element 34.

[0085] A central alignment of the locking jaw 35 relative to the locking element 34 is preferred, particularly in an unloaded basic position according to Figures 5 and 6. Accordingly, the axially shaped strengthening parts 50 in this unloaded basic position approximately in the middle of the longitudinal extension of the holder opening 46. This central basic position can be achieved by spring action, for which purpose, for example, a preferably omega-shaped spring 53 can be provided assigned to each side wall 42.

[0086] Each spring 53 extends from the outside through a slotted opening 54 in the associated side wall 42 and, with its spring legs 55, preferably extending parallel and spaced apart from one another, enters a respective receiving pocket 56 between the openings 52 of a side flank 51. The spring legs 55 rest against the side edges of the receiving pocket 56 for the preferred centering of the locking jaw 35 on the locking element 34.

[0087] The locking or jaw surface 57 of the locking jaw 35 pointing in the direction of the impeller 2 runs in the cross section described above, adapted to the curvature of the running surface 15. In conjunction with an upper side 61 of the locking jaw 35 adapted to the course of the curvature line k, further in particular in conjunction with an imaginary curvature line along which the support surfaces 58 are formed, the locking jaw 35 is doubly wedge-shaped in cross section, with a greatest thickness d at the end regions 59 opposite one another in the circumferential direction U of the impeller 2. Approximately in the center of this circumferential direction U, the locking jaw 35 has a thickness d' which can, for example, correspond to approximately 0.5 to 0.8 times the edge thickness d (see also Fig. 8a).

[0088] The jaw surface 57 is essentially curved in the opposite direction to the curvature line k.

[0089] Furthermore, the jaw surface 57 can have sawtooth-like projections 60 projecting beyond a substantially smooth surface. These projections are furthermore preferably formed integrally and of the same material as the locking jaw 35.

[0090] This can result in two groups of projections 60, with the projections 60 extending in the same direction in a sawtooth pattern within a group assigned in the circumferential direction essentially at the end of the jaw surface 57. However, the groups of projections 60 are arranged such that their projections 60 point away from each other, each further directed outward in the circumferential direction U.

[0091] By lowering the switching plunger 12, which forms an action element E for the wheel locking device 14, from the neutral position shown in Fig. 5 or from the fixed roller position shown in Fig. 6, a targeted loading of the lever part 36 by the extension 32 is achieved, preferably with simultaneous engagement of the rotation-blocking projections 31 in the blocking receptacles 9 of the rotation-blocking part 30. This loading acts in particular directly on the end of the lever part 36 having the pivot axis c.

[0092] During the downward movement of the switching plunger 12 (action element E), the locking element 34 and the locking jaw 35 held thereon are acted upon indirectly via the lever part 36 guided in the slotted receptacle 40, so that, due to the described linear guide, a linear displacement of the locking element 34 and the locking jaw 35 in the direction of movement r onto the running surface 15 results. In particular, the locking jaw 35 is thus moved from a release position into an engagement position according to Figs. 7 and 8. The sawtooth-like projections 60, but possibly also at least least partially the jaw surface 57, are brought into an engagement position with the running surface 15 loaded by the switching tappet 12.

[0093] The pivotal displacement of the lever part 36 about the pivot axis b brought about in this way takes place against the restoring force of the second restoring spring 37, which, for example, as also shown, can be designed as a leg spring, wherein one spring leg also acts on the lever part 36 and one spring leg preferably acts against the fork-fixed holding part 38.

[0094] The superimposed pivoting and linear displacement of the lever part 36 and the locking element 34 is made possible by the guidance of the lever part 36 by means of its axle pin 41 in the slotted receptacle 40.

[0095] By forming support surfaces 47 which are elongated in the circumferential direction U of the impeller 2 or along the curvature line k, from this (first) engagement position, which corresponds to an initial blocking position (see Figs. 7 and 8), a movement of only the locking jaw 35 relative to the locking element 34 in the circumferential direction U into a final blocking position is possible with a corresponding load on the impeller 2 in the direction of rotation, in order to further increase the force acting on the running surface 15 by the resulting wedge effect.

[0096] Figs. 9 and 10 show the two (maximum) possible blocking end positions of the locking jaw 35 for a load f acting in the circumferential direction U (counterclockwise with reference to the illustration in Fig. 9) and a load f' (clockwise with reference to the illustration in Fig. 10). The frictional engagement results in the locking jaw 35 being driven in the same direction of loading, with appropriate guidance. the locking jaw 35 via its axial reinforcement parts 50 in the mounting openings 46.

[0097] The respective support surface 47 has an effective length g viewed in the circumferential direction U or in the direction of the curvature line k. This results in a maximum possible displacement dimension h of the locking jaw 35 with its support surface 58 in both possible directions f and f, with a preferred center position of the locking jaw 35 in the initial blocking position according to Fig. 8 and according to the schematic representation shown in Fig. 8a, which displacement dimension h essentially corresponds to half the length g.

[0098] According to one possible embodiment, with a length g of the support surface 47 of, for example, approximately 3 to 5 mm, a displacement dimension h of, for example, approximately 1.5 to 2.5 mm results. With respect to the rotational axis y of the impeller 2, an offset from the center position of, for example, approximately 1.5° to 3° can result.

[0099] The schematic representations in Figs. 9a and 10a each show the wedge effects when the locking jaw 35 is offset as shown in Figs. 9 and 10.

[0100] The engaged position (regardless of whether a blocking initial position or a blocking final position is assumed) can only be maintained under the constant force applied by the action element E or the switching plunger 12 on the lever part 36. When this force is removed by lifting the switching plunger 12, the locking element 34, together with the locking jaw 35, is moved back into the release position spaced from the running surface 15 via the second return spring 37.

[0101] In the second embodiment shown in Figures 18 to 30, the locking element 34 acting on the locking jaw 35 is designed as the first lever part 62 of a knee assembly 63.

[0102] The toggle lever arrangement 63, which further comprises a second lever part 64, is also in this embodiment, together with the locking jaw 35, a holding part 38 and a second return spring 37, part of a locking assembly 33 (see also Fig. 19), which can be inserted into the fork 3 in a pre-assembled state as such.

[0103] The two lever parts 62 and 64 of the toggle lever arrangement 63 are articulated to one another in a toggle joint 65. The resulting geometric pivot axis c, as more preferably also the geometric pivot axis b of the second lever part 64 in the articulation area of ​​the support part 38, extends preferably in the same direction as the rotational axis y of the impeller 2.

[0104] Away from the area of ​​the knee joint 65, the first lever part 62, which essentially forms the locking element 34, carries an axle 66 with a geometric pivot axis m, the outwardly projecting free ends of which engage in adapted receptacles 67 of the locking jaw 35. The receptacles 67 can, as preferred, be provided in the area of ​​side flanks 51 of the locking jaw 35.

[0105] On the outside of the wall of these side flanks 51, two guide ribs 44 running parallel to one another are preferably formed on the locking jaw 35, which cooperate with adapted counter ribs 35 of the holding part 38 (see Fig. 22) for the linear guidance of the locking jaw 35 in the direction of movement r. This provides a preferred direction of displacement. The locking jaw 35 was essentially accessible in a direction perpendicular to the running surface 15.

[0106] In this embodiment, too, the locking jaw 35 is provided with sawtooth-like projections 60 on the underside of the jaw surface 57.

[0107] The part acting on the knee joint assembly 63 for displacement is not directly part of the knee joint assembly 63, but rather a separate part that is supplied for application by displacement. Preferably, as in the previously described embodiment, the switching plunger 12 is used as the action element E. Its mode of operation with regard to achieving a neutral position of the roller or a fixed roller position is as previously described.

[0108] By lowering the switching plunger 12, the area of ​​the knee joint 65 is acted upon via the extension 32, possibly also with simultaneous engagement of blocking receptacles 9 and rotation-blocking projections 31, in such a way that the knee lever arrangement is moved from a release position with a first, more strongly angled position of the lever parts 62 and 64 to one another according to Fig. 20 into a second, less angled position (engagement position) of the lever parts to one another according to Fig. 21.

[0109] In the first position (release position), the longitudinal axes u and w connecting the pivot axes b and c and the pivot axes c and m form a (preferably obtuse) angle ß. This angle can be, for example, approximately 95° to 130°, and further, for example, approximately 100° to 115°.

[0110] By applying force to the knee joint 65 by the switching plunger 12, the angle is increased up to a value ß' of, for example, approximately 120° to 150°, and then, for example, approximately 130° to 140°. In any case, an angle ß' of less than 180° is achieved.

[0111] Due to the provided toggle lever arrangement 63, an increase in the contact pressure of the locking jaw 35 acting on the running surface 15 can be achieved with the same force application via the switching tappet 12, whereby this force application can only be maintained in the second position of the toggle lever arrangement 63 under constant load via the switching tappet 12 or via the action element E.

[0112] When the load on the switching plunger 12 is removed by lifting the same, the toggle lever arrangement 63 with the locking jaw 35 automatically returns to the release position due to the non-extended position of the toggle lever arrangement 63 in the engaged position, supported by the second return spring 37 acting accordingly on the second lever part 64.

[0113] Fig. 31 shows a third embodiment in which a toggle lever arrangement 63 according to the second embodiment shown in Figs. 18 to 30 is combined with a quasi-floating locking jaw 35 according to the first embodiment in Figs. 1 to 17.

[0114] The locking element 34 is essentially designed in two parts, firstly as a shaped part which supports the locking jaw 35 in a floating manner according to the first embodiment and has holding openings 46 having support surfaces 47, and secondly as the first lever part 62 of the knee joint arrangement 63.

[0115] With reference to Figures 32 to 48, a fourth embodiment relating to the locking element 34 and the locking jaw 35 is shown and described.

[0116] With reference to Figure 32, it can first be seen that the locking element 34 has a mounting opening 46 in a manner comparable to the locking element of Figures 1 to 17, but this mounting opening 46 is limited in one direction, in the illustrated embodiment the rear direction, by a blocking section 68 formed on the locking element 34. The locking jaw 35 can come into contact with this with an end surface 69 upon corresponding displacement in this direction. This displacement can be achieved in particular by the spring loading of the locking jaw 35 in the raised, non-engaged state, as explained further below. For this purpose, the locking jaw 35 alternatively or additionally also has an overlapping area 70 on the front side, which, alternatively or additionally, can also serve to limit displacement relative to the locking element 34 as a stop area 71 and 72.

[0117] As can be seen in particular from Figures 33 to 35, the locking jaw 35 rests on an associated support surface 47 on the locking element 34 by means of, in the exemplary embodiment preferably a plurality of support surfaces 58 which are elongated in a circumferential direction of the impeller 2, at least in the braking engagement state.

[0118] In this embodiment, several, namely more preferably two, support surfaces 58 aligned in alignment with one another are preferably implemented. In addition, the one or more support surfaces 58 are formed on one or more ribs 73 of the locking jaw 35. Between several ribs provided transversely to the circumferential direction U, A valley 74 or several valleys 74 are preferably formed in the pen 73. The valley surface can serve in the same way as a support surface 58 with appropriate adaptation of the support surface 47.

[0119] In the fourth embodiment, four support surfaces 58 are preferably provided as upper sides of the ribs 73 and / or three support surfaces 58 as upper sides of valleys 74 formed between the ribs 73 in the transverse direction to the circumferential direction U of the impeller 2.

[0120] This design can also be seen in further detail in Figures 42 and 44.

[0121] Furthermore, in this respect, fundamentally in accordance with the first embodiment of Figures 1 to 17, a spring 53 is accommodated in the locking jaw 35. The spring 53 serves in particular to return the locking jaw 35 to an initial position according to Figure 33 after braking intervention. Accordingly, it can serve both for a backward and forward displacement with respect to the circumferential direction U of the impeller 2.

[0122] In the embodiment of Figures 32 to 42, the spring 53 is also preferably formed as a U-shaped spring. It is further preferably retained in the locking jaw 35. For this purpose, one or more locking overlapping sections 80 can be formed in the locking jaw 35 for interaction with the spring legs 55.

[0123] When the locking jaw 35 is displaced from the initial position, the spring legs 55 can act against projections 79 formed on the locking element 34, whereby the spring force required for automatic resetting is built up (see also Figures 33, 34 and 35).

[0124] The locking jaw 35 further comprises, preferably opposite one another, two retaining projections 75 projecting transversely to its extension in the circumferential direction of the impeller 2. These projections are received in adapted longitudinal guides 78 of the locking element 34. As can be seen, for example, from Figure 47, the locking element 34 has projection cams 76 for this purpose, which, in cooperation with one or more counter cams 77, provide the retaining and longitudinal guidance 78.

[0125] With regard to the locking jaw 35, this embodiment also results in a double wedge-shaped cross-section with support surfaces 58 aligned so as to match the curvature line k running opposite to the running surface 15 of the impeller 2. The jaw surface 57 preferably runs so as to match the curvature of the running surface 15. Accordingly, in the circumferential direction U, approximately in the center of a locking jaw 35, there is a thickness d' between the curvature line k and the curvature of the jaw surface 57 or the sawtooth-like projections 60 which also define the jaw surface 57, which thickness d' can correspond to approximately 0.5 to 0.8 times, possibly up to 0.95 times, the edge-side thickness d (see Figure 41).

[0126] Figures 35 and 36, or the schematic representations in Figures 35a and 36a, show, with respect to the fourth embodiment, the two (maximum) possible blocking end positions of the locking jaw 35 for a load f acting in the circumferential direction U (counterclockwise with reference to the illustration in Fig. 35 or 35a) and a load f (clockwise with reference to the illustration in Fig. 36 or 36a). Here, too, the frictional engagement results in the locking jaw 35 being driven in the same direction of load. hung, with appropriate guidance of the locking jaw 35 in the longitudinal guides 78 of the locking element 34.

[0127] The locking element 34, similar to the embodiment of Figures 1 to 17, has a core section 43 into which the lever part 36 engages. However, in this embodiment, the lever part 36 is assigned to the locking element 34 and is U-shaped in a central cross-section transverse to the pivot axis c, with a downwardly opening U-shaped opening.

[0128] On the outside of this U-shaped configuration, the axle pins 41, already described in the first embodiment, are provided, preferably directly molded here. The axle pins 41 engage in slotted receptacles 40 of the locking element 34.

[0129] In contrast to the first-described embodiments of the locking element 34 and the locking jaw 35, the locking jaw 35 no longer has any independently movable parts. The locking jaw 35 is formed as a single piece, with the exception of the spring 53—preferably made of metal. Advantageously, it can thus be provided as a single plastic injection-molded part, which is accommodated in the locking element 34 in a slidingly displaceable manner. A captive mounting on the locking element 34 can also be provided by the spring 53.

[0130] In the following, identical, or at least functionally identical, parts of this embodiment are provided with the same reference numerals as in the first-described embodiment. In this respect, reference can also be made to the description of these parts there.

[0131] The above statements serve to explain the inventions covered by the application as a whole, which each independently develop the state of the art by at least the following combinations of features, whereby two, several or all of these combinations of features can also be combined, namely:

[0132] A roller which is characterized in that the support surface 47 is elongated in a circumferential direction U of the running wheel 2 and that the support surface 58 is movable along the support surface 47 in the circumferential direction U during a movement from the initial blocking position to the final blocking position, so that the support surface 58 as a whole is offset in the final blocking position in the circumferential direction U to the support surface 47 and to its position in the initial blocking position.

[0133] A roller which is characterized in that the locking element 34 has a holding opening 46 for the locking jaw 35 which is elongated in the circumferential direction U of the running wheel 2.

[0134] A roller which is characterized in that the locking jaw 35 is double-wedge-shaped in cross-section, with a greatest thickness d at the end regions opposite in the circumferential direction U of the impeller 2.

[0135] A roller characterized in that the locking jaw 35 has a reinforcing part 50 which cooperates with the support surface 47.

[0136] A roller characterized in that the reinforcing part 50 is made of a different material than the material of the locking jaw 35.

[0137] A roller characterized in that the reinforcing part 50 is axially formed.

[0138] A roller characterized in that the locking jaw 35 is held on the locking element 34 by means of the reinforcing part 50.

[0139] A roller which is characterized in that two reinforcing parts 50 are provided which are arranged at a distance from one another in the circumferential direction U of the impeller 2.

[0140] A roller which is characterized in that the support surface 58 is elongated in a circumferential direction U of the impeller 2.

[0141] A roller characterized in that the support surface 58 is formed by an upper side of one or more ribs 73 and / or an upper side of valleys 74 formed between ribs 73.

[0142] A roller which is characterized in that the locking jaw 35 has a holding projection 75 which projects transversely to its extension in the circumferential direction U of the running wheel 2.

[0143] A roller characterized in that the support projection 75 is elongated in the circumferential direction U of the impeller 2.

[0144] A roller characterized in that the support projection 75 is composed of several individual projections.

[0145] A roller characterized in that the second position can only be maintained under constant force application by the action element E.

[0146] A roller characterized in that the lever parts 62 and 64 each have a longitudinal axis u and m and that the longitudinal axes u and m enclose an angle ß' of less than 180° to each other in the second position.

[0147] A roller characterized in that the action element E acts on the toggle lever arrangement 63 in the region of the knee joint 65.

[0148] A roller characterized in that the action element E is designed as a separate element from the toggle lever arrangement 63.

[0149] A roller characterized in that the action element E is movable between a contact position and a distance position with respect to the toggle lever arrangement 63.

[0150] A roller which is characterized in that the action element E is designed as a linearly movable plunger.

[0151] A roller which is characterized in that the plunger is designed as a switching plunger 12, which also allows a pivoting blocking of the roller 1.

[0152] All disclosed features are essential to the invention (individually, but also in combination with one another). The disclosure of the application hereby fully incorporates the disclosure content of the associated / attached priority documents (copy of the prior application), also for the purpose of incorporating features of these documents into claims of the present application. The subclaims characterize, even without the features of a referenced claim, independent inventive developments of the prior art with their features, in particular for filing divisional applications based on these claims. The invention specified in each claim may additionally comprise one or more of the features provided in the above description, in particular with reference numbers, and / or specified in the list of reference numbers.The invention also relates to designs in which individual features mentioned in the above description are not implemented, in particular insofar as they are clearly unnecessary for the respective intended use or can be replaced by other technically equivalent means. List of reference symbols 1 roller 29 bearings 2 Impeller 30 Rotation blocking part 3 Fork 31 Rotation locking projection 4 mounting pins 32 extension 5 Fork shell part 33 Locking assembly 6 Fork shell part 34 Locking element 7 Fork leg 35 Locking jaw 8 Fork cavity 36 Lever part 9 Blocking receptacle 37 second return spring 10 Switch cam 38 Bracket part 11 Coupling opening 39 Axle 12 Switch plunger 40 slotted 13 Swivel locking device 41 Axle pin 14 Wheel locking device 42 Side wall 15 Tread 43 Core section 16 gear 44 guide rib 17 Cam part 45 Counter rib 18 Ring collar 46 Bracket opening 19 first return spring 47 support surface 20 Counter cam 48 Limiting surface 21 Control surface 49 Bottom 22 Control trough 50 Reinforcing part 23 control recess 51 side flank 24 Stop projection 52 Breakthrough 25 circumferential groove 53 spring 26 locking plate 54 slotted opening 27 locking formation 55 spring strut 28 Direction locking part 56 Receiving pocket 7 Jaw surface d' Thickness 8 Support surface f Load 9 End area f Load 0 Projection g Length 1 Top surface h Offset dimension 62 first lever part k curvature line 63 Knee lever arrangement with swivel axis 64 second lever part r direction of movement 65 Knee joint and longitudinal axis 66 Axis w Longitudinal axis 67 mount x swivel axis 68 Blocking section y axis of rotation 69 inner surface 70 Overlap area E Impact element 71 Stop area UU mf direction 72 stop area 73 Rib a Angle 74 Valley ß Angle 75 Bracket projection ß' angle 76 V or jump cams 77 counter cams 78 Longitudinal guide 79 lead 80 Latching overlap section a Actuating axis b Pivoting axis c Pivoting axis d Thickness

Claims

Claims 1. Roller (1), in particular a swivel roller, with a wheel (2) having a pivot axis (y) and a running surface (15), wherein a locking element (34) with a locking jaw (35) is provided and the locking element (34) is movable between a release position and an engagement position in which the locking jaw acts on the running surface (15) to lock the wheel (2), wherein furthermore the locking jaw (35) in the engagement position is movable from a locking initial position to a locking end position by a rotational movement of the wheel (2) itself, with support on the locking element (34), wherein in addition the locking jaw (35) is wedge-shaped in a cross-section in which the pivot axis (y) is represented as a point, and the locking element (34) has a support surface (47) for the locking jaw (35) and the locking jaw (35) has a bearing surface (47) with the support surface (47) has a cooperating support surface (58),characterized in that the support surface (47) is elongated in a circumferential direction (U) of the wheel (2) and that the support surface (58) is movable along the support surface (47) in the circumferential direction (U) during movement from the initial blocking position to the final blocking position, such that the support surface (58) is offset in the circumferential direction (U) in the final blocking position relative to the support surface (47) and its position in the initial blocking position.

2. Roller according to claim 1, characterized in that the locking element (34) has a retaining opening (46) for the locking jaw (35) that is elongated in the circumferential direction (U) of the roller (2).

3. Roller according to one of the preceding claims, characterized in that the locking jaw (35) has a double wedge-shaped cross-section. The roller is designed with a maximum thickness (d) at each of the end regions opposite the circumferential end (U) of the wheel (2). Roller according to one of the preceding claims, characterized in that the locking jaw (35) has a reinforcing element (50) that interacts with the support surface (47). Roller according to claim 4, characterized in that the reinforcing element (50) is made of a material different from the material of the locking jaw (35). Roller according to one of claims 4 or 5, characterized in that the reinforcing element (50) is axially shaped. Roller according to one of claims 4 to 6, characterized in that the locking jaw (35) is held on the locking element (34) by means of the reinforcing element (50). Running roller according to one of claims 4 to 7, characterized in that two reinforcing parts (50) are provided spaced apart from each other in the circumferential direction (U) of the running wheel (2).Roller according to one of the preceding claims, characterized in that the support surface (58) is elongated in a circumferential direction (U) of the wheel (2). Roller according to one of the preceding claims, characterized in that the support surface (58) is formed by a top surface of one or more ribs (73). A roller according to any one of the preceding claims, characterized in that the support surface (58) is formed by one or more upper surfaces of valleys (74) formed between ribs (73). A roller according to any one of the preceding claims, characterized in that the locking jaw (35) has a mounting projection (75) projecting transversely to its extent in the circumferential direction (U) of the wheel (2). A roller according to claim 12, characterized in that the mounting projection (75) is elongated in the circumferential direction (U) of the wheel (2). A roller according to claim 12 or 13, characterized in that the mounting projection (75) is composed of several individual projections.Roller (1), in particular a steering roller, with a wheel (2) having a pivot axis (y) and a running surface (15), wherein a locking element (34) with a locking jaw (35) is provided and the locking element (34) is movable between a release position and an engagement position in which the locking jaw (35) acts on the running surface (15) to lock the wheel (2), in particular a roller (1) according to one of claims 1 to 14, wherein furthermore the locking element (34) is formed as a first lever part (62) of a toggle lever arrangement (63) and is rotatably connected to a second lever part (64) of the toggle lever arrangement (63) in a toggle joint (65), wherein, in addition, an action element (E) moves from a first, more angled position to a second, less angled position under movement of the toggle lever arrangement (63). The locking jaw (35) is moved into the engagement position in the angled position, characterized in that the second position can only be maintained under constant force exerted by the action element (E). Roller according to claim 15, characterized in that the lever parts (62, 64) each have a longitudinal axis (u, m) and that the longitudinal axes (u, m) form an angle (β) in the second position. z) of less than 180° to each other. Roller according to one of claims 15 or 16, characterized in that the action element (E) acts on the toggle lever assembly (63) in the region of the toggle joint (65). Roller according to one of claims 15 to 17, characterized in that the action element (E) is designed as an element separate from the toggle lever assembly (63). Roller according to one of claims 15 to 18, characterized in that the action element (E) is movable between a contact position and a distance position with respect to the toggle lever assembly (63). Roller according to one of claims 15 to 19, characterized in that the action element (E) is designed as a linearly movable plunger. Roller according to claim 20, characterized in that the plunger is designed as a switching plunger (12) which also allows a pivoting lock of the roller (1) to be achieved.

Images