Patent Application
20230128362
The present invention relates to the field of poles used for hiking, and Nordic walking but also, in the broadest sense, for other types of sport such as, for example, cross-county skiing or alpine skiing, alpinism, etc.
In particular, but not exclusively, the field of hiking or Nordic walking is known to have pole designs which are adjustable in their length. The adjustment capability can be used, on the one hand, so that the length of the pole can be adjusted in line with requirements, but also, on the other hand, so that the pole can be reduced to the smallest possible packing size, i.e. the length can be configured for reduction to such a pronounced extent that the pole can be stowed, for example, in a backpack or similar. Such designs in which so-called inner tubes of small diameter are mounted in a displaceable manner in an outer tube of a somewhat larger diameter, and in which the relative position of the tube portions can be secured by an arresting mechanism, are known, for example, from DE 297 06 849 or else also from DE 497 08 829 or EP 1 450 906.
With use being made of such designs, it is imperative for the individual tube portions to have different diameters and, in addition, it has to be ensured, so that in particular the small packing size can be achieved, that the tubes can also actually be displaced largely one inside the other.
It can thus end up being the case that in particular in the lower region, where typically the thinnest tube is arranged, the pole becomes very thin and therefore no longer has a sufficient level of inherent rigidity for a number of applications; in addition, the designs disclosed in the documents above are often not looked upon so positively by the user since the relative position of the individual pole-tube portions has to be ensured by these pole-tube portions being rotated relative to one another, for which purpose it is necessary for corresponding rotary forces to be applied manually.
Alternative mechanisms, in which the axial position of different tube portions relative to one another is not secured by an internal arresting mechanism, are known, for example, from WO 2010/085905 or else also from DE 694 01 765 or EP 1 217 224 or EP 098 898; however, these external designs are often not suitable for mounting more than two pole tubes in a displaceable manner one insider the other, and this can also then result in the packing size not being sufficiently small.
There are so-called folding poles, for example known from WO 2012/104424, and in these individual pole segments are connected via plug-fit connections. The pole segments in this case can have essentially the same diameter, and the pole segments are connected to one another via a pull cable so that, once fitted together, the individual pole segments the segments are connected rigidly to one another as a result of this pull cable being subjected to tension. The problem of these designs is that the flexible pull cable has to connect the individual pole segments to one another and run through these segments. This means that such designs are not straightforward to produce and service and are also difficult to put together in accordance with different customer requirements.
This is where the present invention comes in. It is the object of the present invention to provide a folding pole which is improved in particular in respect of modularity, simplicity in relation to assembly, simplicity in relation to alteration and simplicity in relation to repair or changeover of parts.
This object is achieved by a folding pole as claimed in the claims.
In specific terms, the present invention relates to a folding pole having at least three or having at least four, or preferably five, tube portions, wherein, in the assembled state of the folding pole, the tube portions are connected rigidly to one another so as to be oriented along the pole axis via plug-fit connections, and, in the collapsed state, at least two or at least three tube portions are connected to one another just via a movable connecting element, and wherein a pole handle is arranged on an uppermost tube portion and a pole tip is arranged on a lowermost tube portion.
At least one of the plug-fit connections here is realized via an external clamping mechanism and/or a form-fitting latching device.
It is also possible for one connection to be designed in the form of an external clamping mechanism, e.g. having a lever, and for a further connection to be designed in the form of a form-fitting latching device (arranged on the outside or inside), in which case the external clamping mechanism is preferably provided closer to the handle or on the tube portion on which the pole handle is arranged, and the connection made up of the form-fitting latching device follows in the downward direction.
The clamping mechanism is fastened on a first tube portion, and a second tube portion, which has an external diameter smaller than or more or less equal to the internal diameter of the first tube portion and which is mounted in a displaceable manner per se in the first tube portion, can be fixed in the relative axial position by the external clamping mechanism.
The alternative or additional form-fitting latching device is realized on a second tube portion, wherein the second tube portion has an external diameter smaller than or more or less equal to the internal diameter of a first tube portion, and it can be pushed into the first tube portion and fixed in the relative axial position by the form-fitting latching device.
The further plug-fit connections here are designed in the form of straightforward plug-fit connections in which, in the fitted-together state, tube portions are fixed only in one axial direction, provided they are not held together by the pull cable.
The tube portions are connected to one another via at least one pull cable, which is fastened on the lowermost tube portion and on the uppermost tube portion and is arranged so as to run through the interior space of the at least two or three central tube portions.
The folding pole is designed such that it can be moved or transferred from the collapsed state to the assembled state by the (further) plug-fit connections being fitted together or sliding one inside the other by the continuous bracing of the pull cable, and then, with the external clamping mechanism released or with the latching device released, by the second tube portion being pulled out of the first tube portion to the extent where the pull cable is braced, and by the external clamping mechanism or the form-fitting latching device being fixed. This means that the further plug-fit connections are then fixed in both axial directions. Possible latching devices used come in different designs, for example those which are disclosed in WO 2018/224417 and have an external rocker, but also those which are described in WO 2019/129484 and are arranged on the inner side.
The latching device can preferably be constructed as follows: as a clamping device for the form-fitting releasable axial securing action of an inner-tube portion which can be pushed into an opening of the clamping device fastened on an outer tube, wherein the clamping device has an encircling plastic cuff, to the outside of which a clamping lever is attached, such that it can be tilted counter to the restoring force of a spring element, via an axial element which is arranged perpendicularly in relation to the pole axis, wherein the plastic cuff has two protrusions with through-passage openings and/or apertures for the axial element, and the clamping lever is mounted between these protrusions such that it can be tilted about the axial element, and wherein the plastic cuff has a radial through-opening, wherein the clamping lever has a first lever arm with an externally accessible pressure-exerting region for releasing the clamping device and a second lever arm, which is arranged on the other side of the axial element, wherein the second lever arm has a clamping protrusion which is arranged essentially radially in relation to the pole axis, engages through the radial through-opening in the plastic cuff into an axial through-opening of the plastic cuff and engages in a form-fitting manner in a groove or aperture of the inner tube, or of a guide insert connected to the inner tube, in order for the two tubes to be secured axially. However, it is also possible for the inner tube to be clamped in the outer tube by a different technical solution to that described above.
The further plug-fit connections or at least one of these is/are designed so as to have, on the one tube portion, a guide stub which is provided with an axially running, central through-opening for the pull cable, is firmly fastened in said tube portion by way of a fastening portion and, axially opposite, has a stub region which is exposed in the folded state of the pole and can be pushed into the other tube portion, wherein the fastening portion and stub region have a through-opening for the pull cable.
In the stub region so as to close the latter off in relation to the following tube section, there is then, for each plug-fit connection, a conical terminating stub with an axial through-opening for the pull cable. The conical terminating stub is fastened in a releasable manner, e.g. screwed in or latched in, in the stub region and each conical terminating stub, or at least one of these conical terminating stubs, has an axial slot, by way of which the pull cable can be introduced into the through-opening in the radial direction.
The axial slot for the introduction of the pull cable into the through-opening in the radial direction is in an exposed state or can be exposed or opened when the conical terminating stub is removed from the stub region.
The axial slot of the conical terminating stub can be designed in different ways. Typically, the conical terminating stub is formed in one piece. It is then possible for the conical terminating stub either, as a rigid component, to have an axial slot which is of essentially predefined width and through which the pull cable can be introduced into the through-opening in the radial direction when the conical terminating stub has been removed from the stub region.
As an alternative or in addition, it is also possible for the conical terminating stub, as a flexible component, to have an axial slot which is variable in width and for the introduction of the pull cable into the through-opening in the radial direction, in the state in which it has been released from the stub region, is preferably widened counter to a certain restoring force.
However, it is also possible for the axial slot to be provided by the conical terminating stub, as a flexible component, having two conical-terminating-stub halves connected via preferably a film hinge, wherein the film hinge connects the two conical-terminating-stub halves only on one side of the through-opening. It is also possible for such a conical-terminating-stub component to be formed in two parts, i.e. without a film hinge, although it should then be ensured that there are positioning aids provided to orient the two halves precisely relative to one another in the assembled state, which is important, in particular, when an external thread is provided for fastening purposes in the guide stub. The conical-terminating-stub halves here are preferably of essentially symmetrical design and are defined by a central axial separating surface. Such a conical terminating stub can be removed from the stub region (for example by being unscrewed) and can then be swung open to a certain extent via the film hinge to expose the axial slot. It is not necessary, however, for the conical terminating stub to be swung open completely; it is sufficient for the two halves to be widened to some extent in the vicinity of the axial slot in order for the latter to be opened for the introduction of the pull cable. The film hinge here is preferably provided on an axial end surface of the conical terminating stub. In the mounted/screwed-in state of the conical terminating stub, the axial slot assumes a parallel spacing of 0 or, in sub-regions of the thread, even smaller. It is thus possible for example for force-fitting bracing to be transferred to the final thread turns and therefore for an undesired unscrewing action of the terminating stub to be prevented. It is normally the case with the film-hinge variant that the abutment surfaces butt in a parallel state against one another (that is to say the slot is barely open when the stub is in the mounted state, but is capable of being opened when the stub has been removed). If the abutment surfaces run slightly conically in relation to one another, it is possible (since the surfaces butt in a parallel state against one another during the mounting operation) for a securing action to be achieved, in addition, via a slight increase in the external diameter. Of course, it is also possible for this to occur when the surfaces remain parallel to one another and the external thread of the terminating stub is increased (in sub-regions).
Releasable here, in particular in relation to the conical terminating stub, should be understood to mean that the conical terminating stub can be separated off in a non-destructive manner, possibly with the aid of a tool and in a reversible manner, without any need to release a strong material bond (with the exception of, for example, a releasable thread-locking fluid or the like) such as, for example, adhesive bonding; e.g. the conical terminating stub can be unscrewed or released by a latching connection, and it can also be screwed or latched in again.
By virtue of the proposed design with the conical terminating stubs, which can be unscrewed or removed by the release of a latching connection and have, or provide, an axially running lateral slot, through which the pull cable can be inserted into, and removed from, the through-opening, it is possible for such a folding pole to be readily taken apart in a reversible manner without the pull cable being destroyed. For this purpose, it is possible, following release of the plug-fit connections, in a first step for the lowermost conical terminating stub to be unscrewed or, by release of the latching connection, separated and then for the pull cable to be pulled out of the lowermost tube portion, possibly along with the spring fastened thereon. This frees the lowermost tube portion. The conical terminating stub of the lowermost tube portion can then be removed from the pull cable with the aid of the slot of the stub. If the conical terminating stub of the next-following tube portion is then unscrewed or, by release of the latching connection, removed, then it is possible, in turn, for the conical terminating stub, on account of its axial slot, to be separated from the cable, and the cable to be pulled through this further, following tube portion. This also then frees the second-from-bottom tube portion and allows the latter to be, for example, replaced or changed over for another design. The lateral slot of the conical terminating stub can be configured such that the pull cable can be latched into the through-opening of the conical terminating stub, or unlatched from the same, with a slight resistance, or, as described above, it is also possible for it to be realized via a film hinge, by means of which two conical-terminating-stub halves separated more or less in the axial direction are connected on only one side of the through-opening.
The conical terminating stub is preferably produced in the form of an injection-molded component, for example made of a thermoplastic material. Examples of possible materials are polyamide, polyethylene, polypropylene, polycarbonate, polyurethane and also mixtures or glass-fiber-reinforce variants thereof.
It is equally possible for the stub region to consist of such a material; however, the stub region can also be produced from metal. If an internal thread has to be provided in the stub region, because the conical terminating stub is to be screwed into such a thread, then this internal thread either can be provided directly in the stub region or it is also possible to provide a separate internal-thread insert, made of plastic or metal, which is inserted into the stub region and fastened therein, preferably by adhesive bonding and/or pressing.
A first preferred embodiment is characterized in that each conical terminating stub has a conically tapering region which is exposed when the pole is in the folded state, and this conically tapering region contains means via which the conical terminating stub can be gripped and screwed in or unscrewed or made to establish a latching connection or released from a latching connection. These means are preferably designed in the form of at least two, or precisely two, in particular oppositely located notches, steps or shoulders (e.g. also milled recesses), which preferably have mutually parallel surfaces forming planes at a tangent to the axis of the pole.
These means can be designed in the form of precisely two oppositely located steps or notches, which have mutually parallel surfaces which form planes at a tangent to the axis of the pole, wherein these surfaces run parallel to the direction in which the axial slot runs. It is thus possible, for example using a customary open-end wrench, for the respective conical terminating stub to be readily unscrewed and screwed in again or to be made to establish a latching connection or be released therefrom.
A further preferred embodiment is characterized in that the two or three lowermost tube portions are connected to one another via the aforementioned further plug-fit connections, and in that the subsequent or the uppermost of the three tube portions has a terminating stub (with a through-opening for the pull cable, wherein the pull cable runs freely in this opening and is not fastened) at its upper end, wherein this terminating stub has a head region, which projects upward out of the tube portion, and a neck region, by way of which the terminating stub is firmly fastened in the tube portion, and wherein the head region and neck region are designed in the form of two separate components which can be screwed or latched in in a releasable manner one inside the other. This design further increases the service-friendliness since it is then also possible for the subsequent or uppermost tube portion to be removed and separated from the pull cable by the lower two tube portions, as described above, being separated from the cable, by the head region of the terminating stub being, for example, unscrewed, and then by the cable likewise being straightforwardly pulled through this further tube portion. It is also possible in this way for the third tube portion (or, if there are four portions with three straightforward plug-fit connections, the fourth tube portion), as seen from below, to be separated off.
A further preferred embodiment is characterized in that an uppermost terminating stub is provided in the first tube portion, and the pull cable is fastened in this uppermost terminating stub in such a manner that, when it is not braced, it can be pulled upward out of the uppermost terminating stub. In particular, preferably, this is achieved by virtue of the uppermost terminating stub containing at least one stepped through-opening, with a tapering in the lower region, and wherein the pull cable is preferably caught in this step by way of a knot or preferably a crimp. This design yet further increases the service-friendliness since it is then also possible for the pull cable, when it is not braced, to be pulled upward out of the uppermost terminating stub. Here too, it is possible for the head region of the uppermost terminating stub and the neck region of the latter to be designed in the form of two separate components which can be screwed in a releasable manner one inside the other.
Above the first tube portion there can be a (yet) further tube portion, into which the first tube portion can be pushed in a displaceable manner and can be secured axially in various positions by way of an external clamping mechanism, wherein the uppermost terminating stub is connected to this further tube portion by way of a further pull cable, so that, when the external clamping mechanism is released, the first tube portion cannot be pulled out of the further tube portion.
The further pull cable is then preferably fastened in a releasable manner at the upper end of the further tube portion or on a handle fastened thereon, preferably so as to be free of rotation, wherein the fastening of the further pull cable can preferably be released, possibly once a cover of the handle has been removed, by the fastening of this further pull cable being freed from the outside in a non-destructive manner, for example via a hook connection.
The pole is preferably one having three lower tube segments, which are connected to one another via two straightforward plug-fit connections, and a fourth tube segment, which follows the three lower tube segments and in which the third tube segment engages with sliding action, and wherein the pull cable is braced by the axial relative position between the third and fourth tube segments being set to a maximum, to achieve bracing of the pull cable. For this purpose, a clamping mechanism with a form fit is preferably provided between the third and fourth tube segments. There is then preferably also a fifth, uppermost tube segment, the latter having an internal diameter which is again somewhat larger than the external diameter of the fourth tube, and the fourth tube is mounted for sliding action in this fifth tube segment, on which the pole handle is also fastened. The relative position in the axial direction between the fourth and fifth tube segments can be fastened in a variable manner, for example via an external clamping mechanism, for example with a lever, as has been described above and also will be described in detail hereinbelow. However, it is also possible for the clamping mechanism to be an internal one.
The fastening of the pull cable on the holder element (which is lowermost, i.e. fastened on the lowermost tube portion) can be of elastically sprung design, preferably by a (helical or elastomer) spring being provided on the holder element of the lowermost tube portion, the pull cable being arranged so as to run through the interior space of the spring. It is preferably the case that at least certain parts of the pull cable are, in particular preferably the entire length of the pull cable in the longitudinal direction is, of tension-resistant and inelastic design. The helical spring preferably has an external diameter such that it can be pulled through the through-openings of the guide stubs, minus conical terminating stub, and through the terminating stub, minus head region.
The pull cable preferably consists of a flexible, longitudinally tension-resistant and non-elastic material, and is preferably provided with a plastic coating or encapsulated in a plastic. The specific configuration of the conical terminating stub with the axial slot now renders the prior-art sheathing of the pull cable with a separate hose unnecessary and even disadvantageous; such a pull cable with a plastic coating, or encapsulated in a plastic layer, can optimally be guided within the pole and perform its function, but also be guided through the conical terminating stub or the slots thereof.
A further preferred embodiment here is characterized in that the first tube portion is the uppermost tube portion, and in that the second tube portion is the first central tube portion, which adjoins the aforementioned tube portion in the downward direction. This allows for particularly straightforward handling; in addition, this design then typically has the uppermost tube portion as that with the largest diameter and has the clamping mechanism far up, which then also results in an ideal weight distribution along the pole axis. In the case of a form-fitting latching device for bracing the cable, the first tube portion is preferably the uppermost or second-from-top tube portion, and the second tube portion is the first central tube portion, which adjoins the aforementioned tube portion in the downward direction. The latching device has, for example, a spring-loaded radial latching pin, which is preferably retained in a radial through-bore of the second tube portion so as to project through the bore counter to the action of a spring. The spring element is preferably a leaf spring, e.g. a spring plate, to the first end of which the latching pin is advantageously fastened, e.g. by riveting. The second end of the leaf spring here preferably projects with self-locking action into a terminating-stub channel arranged along the longitudinal axis of the pole. The self-locking action is achieved, for example, by means of barbs, which, in the case of a spring plate, are arranged at the second end of the latter. The terminating stub is preferably retained in the upper portion of the second tube portion. According to a particularly preferred embodiment, the terminating stub is pushed into the first tube portion, and fastened, by way of its head and has a collar, which rests on the upper end of the second tube portion. The terminating-stub neck, which adjoins the collar at the bottom, is preferably pushed into the second tube portion in the region of overlap between the first and second tube portions.
A further preferred embodiment is characterized in that the further plug-fit connections are designed such that, in the axial stop position, they are secured against the thereby connected tube portions rotating relative to one another about the pole axis, preferably by ensuring the presence of a form-fitting connection which secures against rotation and also preferably locks automatically when the plug-fit connections are pushed together axially. This is important, in particular, when for example the pole tip and the pole handle are both of asymmetrical design, i.e. are each designed in a specific manner in the walking direction. A further preferred embodiment is characterized in that the tube portions are dimensioned (in particular in respect of length, but also in particular in respect of the possible depth to which the second-from-top tube portion is fitted into the uppermost tube portion) such that, when the pole is in the assembled state, the uppermost central tube portion can be pushed essentially all the way into the uppermost tube portion, or can be pushed into the same so that only a short portion remains jutting out. This gives rise, in the collapsed state, to a situation in which, for a folding pole having four tube portions, the uppermost two tube portions are pushed more or less fully one inside the other and the lower two tube portions can be connected to one another loosely and only via the pull cable and, in addition, can be arranged to a certain extent in zigzag fashion. This gives rise to a minimal packing size. According to a particularly preferred embodiment, the closure element here, which is preferably formed from plastic, has a head portion and a neck portion, wherein the neck portion can preferably be fitted into the upper end of the holder element, can be screwed into the same by means of an externally threaded bore, or can be fitted therein, and latched with rotary action, by a bayonet closure. For this purpose, the holder element preferably has an internally threaded bore in its upper region. According to a particularly preferred embodiment, the closure element here is arranged axially above the helical spring. A guide element is preferably arranged, as a stop element, between the helical spring and closure element, and this guide element or stop element has a radial flange resting on the helical spring and an axial guide portion projecting into the helical spring. The radial flange of the stop element here serves as a clear stop surface or bearing surface for the closure element. The lower cable attachment means, i.e. the pull cable, which is knotted or crimped at the bottom, together with guide elements, helical spring and closure element, thus constitute a unit which is easy for the user to remove from the pole tube. In order to change over the cable, the user releases the closure element from the holder element, removes said unit and possibly releases the knot or crimp at the lower end of the pull cable (it is not absolutely necessary to release the knot or crimp since the cable unit can be removed in its entirety). It is thus possible for the cable to be pulled out from the top, preferably through the handle head. A further preferred embodiment of the folding pole proposed here is characterized in that the further plug-fit connections are designed so as to have, on the one tube portion, a guide stub (preferably in one piece and consisting of plastic) which is provided with an axially running, central through-opening for the pull cable, is firmly fastened in said tube portion by way of a fastening portion and, axially opposite, has a stub region which can be pushed into the other tube portion, wherein a preferably radially encircling, outwardly directed bearing flange is provided between the fastening portion and stub region and, in the fitted-together state, the bearing flange is made to stop axially against the tube end of the other tube portion and/or against a tube-terminating cuff provided thereon, wherein this axial stop function is preferably formed asymmetrically about the pole axis, and/or wherein the stub region further preferably has an at least partially conically tapering region at its end which is directed toward the other tube portion.
In general terms, the pole handle can preferably be one which has, for example, a hook-like device for fastening a hand-hold device in particular in the form of a hand loop or of a glove, wherein displaceable or rotatable latch-in means are arranged in the region of the hook-like device such that a loop-form, ring-form or eyelet-form device, which is provided on the hand-hold device is pushed into the hook-like device essentially from above, is fixed with self-latching action in the hook-like device, wherein the hook-like device is preferably arranged on the hand side in the upper region of the pole handle, and wherein the hook-like device further preferably comprises a retaining spike or retaining pin, which is preferably arranged essentially parallel to the pole axis, is offset from the handle body toward the hand side, an introduction slot being formed in the process, or is arranged in the form of an incision in the handle body, wherein the depth of the introduction slot is preferably greater than the width and the thickness of the retaining spike or retaining pin. In specific terms, in other words, the pole handle is in particular preferably one as disclosed in WO 2006/066423. As far as the pole handle is concerned, the disclosure of said document is expressly included in the disclosure content of this present document.
According to a further preferred embodiment, the pole handle is of ergonomic design, for example as is disclosed in EP 2 168 641. According to a particularly advantageous embodiment, the pole handle has a removable cover on its handle head.
At its lower end, the handle head preferably has an axial through-bore, through which the upper end of the pull cable projects into the handle head. The upper cable-attachment means can be configured, for example, in that the upper end of the pull cable is knotted or crimped. Removal of the cover allows the user to access the upper end of the pull cable and pull the pull cable out of the pole, without the pole handle having to be removed (e.g. disengaged from swivel hooks), and to pull the bearing element, along with the pull cable engaged in the hook therein, out of the pole. According to a further preferred embodiment, the pole tip comprises a tip body and a buffer, wherein the tip body and/or the lowermost portion of the pole body are arranged so as to pass through a central opening of the buffer, and wherein the buffer in a is displaceably mounted such that it can be arrested in an axial direction in relation to the pole body in said central opening, and wherein the buffer can be secured in at least two axially different positions in relation to the pole body via a form-fitting connection, wherein the tip body preferably has a latching track, in which latching track a latching body which is mounted in the buffer can engage in a form-fitting manner in order to secure the axial position, the latching body being pivotably and/or displaceably and/or firmly mounted in or on the buffer, and wherein the latching body is in particular preferably designed in the form of a latching lever which is articulated on the outside, wherein the latching lever has its lower end, which is directed toward the asymmetric rolling surface of the buffer, articulated on the outer sleeve and has its upper end, in the arrested position of the buffer, gripping in an at least partially form-fitting manner around the pole tube and/or an inner sleeve and, for release purposes, the latching lever can be pivoted away from an outer sleeve. In specific terms, in other words, the pole tip can be one which is designed specifically for Nordic walking applications, for example one as is described in WO 2008/037098. As far as the design of the pole tip is concerned, the disclosure of said document is expressly included in the disclosure content of this present application.
A further preferred embodiment of such a folding pole is characterized in that, in the case of an external clamping mechanism, the external clamping device comprises a plastic cuff which essentially directly grips around at least one axial portion of the tube portion and, in the closed state, clamps the same, wherein the plastic cuff, at least in the region which grips the tube portion, has at least one axial slot, which renders the circumference of the plastic cuff variable in this region, and, in the remaining axial region, is of essentially encircling design, wherein a respective protrusion is arranged on the plastic cuff on either side of said slot, wherein these protrusions have a coaxial through-passage opening which is arranged essentially perpendicularly in relation to the axis of the tube portion and through which a transverse pin engages, the transverse pin having a stop on the outer side of the second protrusion and, on the outer side of the first protrusion, having an axis of rotation for a clamping lever, this axis of rotation being arranged perpendicularly in relation to the axis of the transverse pin and parallel to the axis of the tube portion, wherein the clamping lever has a lever arm which, when the clamping device is closed, at least partially grips around the plastic cuff, and wherein the clamping lever has a rolling region, which runs eccentrically around the axis of rotation and by means of which it is possible to reduce the spacing between the stop and a mating surface, arranged on the outer side of the first protrusion, for clamping purposes by virtue of the clamping lever being pivoted into the closed position, wherein the mating surface is preferably designed in the form of a metal element, at least part of which is arranged in a depression in the first protrusion, and wherein the mating surface is further preferably designed in the form of a planar surface or in the form of a concave surface, the radius of curvature of which is essentially adapted to the radius of curvature of the rolling region, and wherein the plastic cuff further preferably has at least two, preferably at least three, axially running slots in its upper portion, wherein at least one of these slots is arranged between the two protrusions and these slots are preferably distributed uniformly around the circumference, and/or wherein the aforementioned stop is further preferably of adjustable design, wherein the stop is preferably formed with a thread and the transverse pin is formed with a mating thread, and the stop is designed in the form of a nut or screw, preferably with an encircling toothing formation and/or a tongue and/or a groove for the engagement of an adjusting tool. In other words, the clamping mechanism can preferably be one as is disclosed, for example, in WO 2010/085905. As far as the clamping mechanism is concerned, the disclosure of said document is expressly included in the disclosure content of this present application.
If, for cable-bracing purposes, the folding pole has a form-fitting latching device instead of an external clamping mechanism, then the pole can be configured in a length-adjustable manner throughout. The length-adjustable mechanism here can be an external clamping mechanism which acts in a force-fitting manner, as described in the preceding paragraph. The clamping mechanism is preferably used for telescopic length adjustment of the second tube portion and, for this purpose, is fastened on the first tube portion. It is preferably the case that the lower central tube portion is of length-adjustable configuration. If the folding pole is of length-adjustable configuration, then it preferably has an additional tube portion, preferably adjoining the first tube portion at the top, on which the pole handle is fastened, wherein the external clamping mechanism is fastened on the uppermost tube portion.
The pole tube is preferably configured essentially from aluminum or carbon, wherein, in the case of a carbon design, the transition regions between individual tube portions are reinforced by means of stabilizing sleeves, for example made of aluminum. Further embodiments are specified in the dependent claims.
Preferred embodiments of the invention will be described hereinbelow with reference to the drawings, which serve merely for explanatory purposes and should not be interpreted as being restrictive. In the drawings:
An exemplary embodiment of a folding pole 1 having four tube portions 7-9 is illustrated in
In specific terms, such a pole comprises an uppermost tube portion 7, on which a pole handle 2 is fastened right at the top. In this case, this pole handle 2 is of asymmetric design; in the walking direction, to the front, it is beveled right at the top and has there a trigger knob 5 for a holder mechanism for a hand-hold device and, some way to the rear, has a retaining nose 3, which is designed in a form of a pin with a slot 4 arranged in front of the same. This is a pole handle as is known, for example, from WO 2006/066423 and as can be used, for example, together with a glove or a hand loop, as known from WO 2006/066424, i.e. with a hand-hold device which, between the thumb and index finger, has a loop which can be guided over the retaining nose 3 and then locked with self-latching action in the slot 4. The pole handle also has a grip region 6, which is usually designed in the form of a region with a grip-friendly coating.
An external clamping mechanism 10 is arranged at the lower end of said uppermost tube portion, the tube being able to be—and this applies to all the tube portions—basically a tube made of aluminum or carbon-composite material. In this specific case, the clamping mechanism is an external clamping mechanism as is known from WO 2010/085905, but it could also be a clamping mechanism according to EP 098 898 or according to EP 1 217 224.
In this specific case, the upper region of the clamping mechanism 10 is fastened on the tube portion 7 via an encircling retaining region 13, which typically consists of plastic, and, in the encased region, particularly beneath the retaining region 13, the upper tube portion 7 has an axially running slot, so that the actual clamping region of the cuff, this clamping region being arranged beneath the region 13, causes the outer tube 7 to be firmly clamped onto the inner tube 8, which has been pushed into this, and therefore a force-fitting connection can be established between the two. Accordingly, there is a slotted clamping region 14 beneath the encircling retaining region 13, wherein the slot runs between two protrusions, through which a transversely running pin, which forms an axial clamping element 12, passes. The pin is fixed on the rear side for example by a nut and, on the side which is illustrated here on the front side, it is connected to the lever 11 via a transverse axial element, which forms a point of rotation for the lever. At its fulcrum, the lever 11 has two fork-like widenings, designed in the form of eccentrics, so that the clamping lever 11 in the clamped-together state, as is illustrated here, when the lever has been swung around the pole tube or around the clamping device, the slot is tapered to such a pronounced extent that the clamping takes place, and that, when the lever is swung outward, this clamping is reduced because the eccentric widens the two protrusions to a certain extent and frees the clamping.
In the uppermost tube portion 7, the upper of the two central tube portions 8 has been pushed in from the inside. The external diameter of this upper central tube portion 8 therefore corresponds to just a bit less than the internal diameter of the uppermost tube portion 7, so that displacement capability is ensured, albeit with as little play as possible. The uppermost tube portion 7 here accommodates within it as much as possible of the upper of the central tube portions 8, so that the packing size is kept as small as possible. It is typical here for the tube portion 8 to be pushed in until it stops against an upper fastening stub 27.
The upper of the two central tube portions 8 is followed by a further, lower central tube portion 8′, which has been folded over to some extent here and has the same tube diameter as the upper central tube portion 8. Provided therebetween is a plug-fit connection 17, which has not been connected here. The plug-fit connection 17 has a guide stub 49, which tapers conically 18 at its tip. The guide stub 49 is fastened on the lower of the two tube portions 8′ and is pushed into the same via a fastening region 37; the other tube portion 8 typically has an upper tube-terminating cuff 15, inter alia for protecting the end of the tube, but also for rotation-fixing purposes (cf. below).
The conically tapering region 18 is designed in the form of a slotted conical terminating stub which is inserted in a releasable manner, preferably screwed or latched, into the cylindrical region of the plug-fit connection 17. For this purpose, the conical terminating stub 18, in the region which engages in the cylindrical region of the plug-fit connection 17, has an external thread or latch-in elements (e.g. protrusions) and the cylindrical region of the plug-fit connection 17, on the inner side there, has a corresponding internal thread or, in the case of a latchable clip connection, has apertures, for example in the form of oppositely located bores, into which elastically mounted and movable protrusions can latch. In order to facilitate screwing-in and unscrewing, the conical terminating stub 18, in the exposed, conically tapering region, has two axially oppositely located notches 18′, of which the axially running flanks run parallel, so that a tool can be used to unscrew the conical terminating stub 18.
A lower tube-terminating cuff 19 is provided at the opposite end of the lower of the two central tube portions 8′. Again in a folded-over state, this is followed by the lowermost tube portion 9, which in this case is a butted tube, which in the uppermost portion has the same diameter as the two central tube portions 8, 8′, but tapers downwards.
A pole tip 23 is fastened at the lower end of said lowermost tube portion 9, and this pole tip is of asymmetrical design, i.e., in the lowermost region, it has a beveled and rearwardly tapering rubber buffer 25, which in this case is also designed to be adjustable to the extent where it can be adjusted between at least two positions, namely between the position illustrated here, where a hard tip 24 is arranged so as to pass through a hole in the rubber buffer 25, which is suitable for icy underlying surfaces or gravel, but it is possible for the buffer, when an adjusting lever 26 is tilted down to the right, to be displaced downward and, by the adjusting lever 26 being swung up again, to be fixed there, so that, in this position, the tip 24 to some extent disappears in the opening in the buffer 25 and therefore all that then comes into contact with the ground is the rolling surface of the asymmetric buffer. In other words, this is a tip as is known, for example, from WO 2008/037098.
At the upper end, the lowermost tube portion 9 likewise has a plug-fit connection 17 which is formed essentially identical to that in the case already described, i.e. there is a guide stub 49 which tapers conically 18 at its tip and has an external diameter such that it can be pushed into the lower end of the lower central tube portion 8′.
The conically tapering region 18 here, in this case too, is designed in the form of a slotted conical terminating stub which is screwed into the cylindrical region of the plug-fit connection 17. For this purpose, the conical terminating stub 18, in the region which engages in the cylindrical region of the plug-fit connection 17, has an external thread, and the cylindrical region of the plug-fit connection 17, on the inner side there, has a corresponding internal thread. In order to facilitate screwing-in and unscrewing, the conical terminating stub 18, in the exposed, conically tapering region, has two axially oppositely located notches 18′, of which the axially running flanks run parallel, so that a tool can be used to unscrew the conically terminating stub 18.
The individual tube portions here are connected via a flexible but stretch-resistant pull cable 16, which is made up, for example, of stretch-resistant plastics fibers, e.g. ultra-high-molecular-weight polyethylene (=UHMWPE or high-modulus polyethylene=HMPE, e.g. Dyneema®), meta-aramid or para-aramid (e.g. Kevlar®) or the like, being monofilament and/or braided and/or sheathed. It is likewise possible to have a possibly sheathed wire cable. The pull cable 16 preferably has a thickness of 0.25-6 mm, preferably 0.4-3 mm, in particular preferably 0.5-2 mm. For ensuring the tensile strength of the pull cable, it is preferred to use, for example, multifilaments made up of a plurality of parallel monofilaments, e.g. made of ultra-high-molecular-weight polyethylene (=UHMWPE or high-modulus polyethylene=HMPE), possibly encapsulated in a carrier material, or multifilaments made up of a plurality of braided monofilaments, e.g. made of ultra-high-molecular-weight polyethylene (=UHMWPE or high-modulus polyethylene=HMPE), possibly encapsulated in a carrier material individually and/or in the form of a braiding. Chain-like pull cables are also possible. By means of the latter, the individual tube portions 8′ and 9 along with the two upper tube portions 7, 8 pushed one inside the other are connected loosely in this position, which is advantageous for transporting purposes and prevents the individual parts from getting lost. Certain portions of the pull cable 16, in particular the portions provided for folding, can be provided with a protective sheathing, preferably in the form of a PVC hose. The pull cable is preferably a flexible but stretch-resistant one with a thickness ranging from 0.5 to 1.5 mm, e.g. made up of braided UHMWPE fibers obtained by gel spinning, encapsulated or provided with a coating from a thermoplastic material.
The detail which is presented as an insert to the right of
The terminating stub 34 also has, as illustrated in
According to a further preferred embodiment, the terminating stub 34 can also be designed for a clamping mechanism according to WO 2012/104424, i.e. for an external form-fitting clamping mechanism with a spring-mounted rocker (cf.
As described, the terminating stub 34 preferably has a head region 34a, which is screwed into the lower region 70/34b. Such a head region 34a, which typically also has one or more axial slots, has a narrow axial through-opening for the pull cable and, in the region which projects into the lower region of the stub, an external thread 72. The extension region has a corresponding upper region with an internal thread, and the lower region of the terminating stub 34 has a continuous axial through-opening of large diameter. If the tube portion 8 is to be separated from the pull cable, it is correspondingly possible, as described above, once the lower two tube portions have been separated off, for the head region 34a to be unscrewed, and then for the pull cable to be pulled upward through the tube portion 8 and, therefore, for this latter tube portion also to be separated off.
It is also the case in the two alternative exemplary embodiments of
The poles according to the exemplary embodiment illustrated in
The plug-fit connection 17 is formed in two parts. The stub region 49, which has a head portion with a conically tapering region 18 in the form of the conical terminating stub, designed as a separate component, projects here, by way of a neck portion, into the upper portion of the fastening portion. It is possible here for the stub region 49 to be configured, for example, from plastic and for the fastening portion 37 to be configured from aluminum or composite materials. In the exemplary embodiment illustrated in
In
The conical terminating stub additionally has two lateral notches 18′, which are provided in the conical region which projects out of the stub region 49. These notches 18′ have axially running flanks, which are located parallel, so that the conical terminating stub 18 can be readily gripped, and unscrewed or screwed in, using an open-end wrench or a similar tool.
Right at the top, the further pull cable 16′ is fastened by a cable-fastening element, as is illustrated in
It is then also possible for the further pull cable 16′ to be readily released by the additional tube portion 79 and the uppermost tube portion 7 being pushed as far as possible one inside the other by virtue of the outer clamping being released, the bracing of the further pull cable 16′ being relaxed as a result, and it is then possible for the bearing element to be pulled upward out of the handle head by at the retaining ring 89, for the hook 86 to be separated from the loop 85, and then for the uppermost tube portion 7 to be pulled downward out of the additional tube portion 79.
Along with the slotted conical terminating stub and the terminating stub 34, in the case of which the head region 34a can be unscrewed, it is thus possible for the folding pole to be non-destructively taken apart and assembled again, and for parts to be changed over, renewed or otherwise altered.
| Number | Date | Country | Kind |
|---|---|---|---|
| 00140/20 | Feb 2020 | CH | national |
This application is a National Stage of Application No. PCT/EP2021/052355 filed Feb. 2, 2021, claiming priority based on Switzerland Patent Application No. 00140/20 filed Feb. 7, 2020.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2021/052355 | 2/2/2021 | WO |
