Quick-adjust walking stick resp. underarm crutch

Abstract

The invention relates to a walking aid (30) with a device (32) for changing the length (40) by means of a control element (1) on a handle (35) of the walking aid (30). This device is designed with a main tube (11) and an adjustable tube (15) that is longitudinally displaceable relative to the main tube. These tubes are displaceable relative to each other for changing the length (40) and can be locked or released relative to each other by the device (32) for length adjustment. According to the invention, this device (32) has a slider (18) which is movable via a mechanism from the remotely arranged control element (1) and which has a transition (18c) from a first plane (18a) to a second plane (18b) orthogonal to the direction of movement of the control element (1), as well as an engagement element (17).The engagement element (17) can be moved by actuating the slide (18) - into a locked position (32a) in the area of ​​the first level (18a), in which the engagement element (17) engages in a recess or indentation (33) of the adjusting tube (15), or - into an unlocked position (32b) in the area of ​​the second level (18b), in which the recess or indentation (33) of the adjusting tube (15) can be released by the engagement element (17).

Description

[0001] The invention relates to a walking or standing aid designed to change its length by means of a control element on a handle according to the preamble of claim 1 or a mechanism for changing the length of a walking aid, as well as a corresponding method for changing the length of a walking aid.

[0002] The invention specifically relates to walking and standing aids, such as crutches, walking sticks, walking sticks, forearm crutches, axillary crutches, rollators, standing aids, etc., which are adjustable in length or height between the handle and the floor during use. Among other things, such walking and standing aids can facilitate rising from a seated position by having a shorter length, adapted to the seated position, before or during rising, which can then be adjusted to a longer length, adapted to the standing position, after rising. Such length adjustment can also be advantageous when the user climbs steps or stairs, wants to bend down, pick something up from the floor, etc.

[0003] An example of such a walking aid is shown in DE202004011326U1. Instead of an elastically mounted positioning element for length adjustment that is actuated on the tube, a lockable pneumatic device is proposed, similar to WO12121492, CN111135022, US7350531 or WO2020117839.

[0004] DE20108176U1 describes the installation of a configurable gas spring in a walking aid, which prevents the exceeding of a defined maximum load on a diseased leg by releasing the gas spring. A similar invention is described in US2011271992.

[0005] US2630128 shows a crutch with a height-adjustable handle. An axial slider in the handle actuates a pin that engages two adjustable tubes, allowing adjustment of the handle height and the length of the tubes relative to each other. In the unactuated position, the pin engages in recesses of an inner tube, thus adjusting the relative position between the handle and the ground. Accordingly, in the lowered position, the inner tube must be able to protrude just above the handle.

[0006] US3157188 ​​proposes a hydraulic solution, which, however, is very complicated and elaborate in its design, especially with the required motor-pump unit and the necessary battery, which makes passive operation impossible.

[0007] US4252138 shows an externally mounted rack and pinion on a crutch and a latch that engages with it for releasing / fixing a height adjustment. The numerous protruding external components are not only impractical to handle (snagging, accidental release upon bumping, etc.) but also pose a risk of injury.

[0008] In the case of known internal mechanisms with bolts, teeth, or similar components, the upper, smaller tube slides into the larger lower one. This is the only way to securely mount the mechanism in the upper tube and maintain the necessary distance from the actuating mechanism on the handle. However, such a tube size arrangement is actually contrary to the mechanical strength requirements. Many of the mechanical solutions used, such as US5036873 or CN207492927, require a great deal of space within the tube, almost completely filling its cross-section, and are correspondingly complex and heavy.

[0009] The known solutions have disadvantages in one direction or another, especially regarding handling, complexity and effort of implementation, number and assembly of the required components, weight, reliability, long-term durability, safety, etc. Some of these disadvantages have already been mentioned above as examples.

[0010] The object of the present invention is therefore to create a device or provide a method that does not have, or minimizes, the aforementioned disadvantages. In particular, an improved walking aid is to be provided. Specifically, a walking aid with length-adjustable handles is to be provided, which is robust, reliable, and easy to use, maintain, and adjust for the user.

[0011] Specific tasks include simplifying the design and improving reliability, as well as, for example, avoiding / reducing safety problems.

[0012] Specifically, it can also be seen as a task to provide a mechanism that can be integrated into a walking or standing aid, which provides a compact locking mechanism between two tubes of a crutch stick that can be released with little force.

[0013] The problems are solved by the features of the independent claim. Advantageous developments and embodiments are set out in the figures and in the dependent claims, as well as in the following description.

[0014] According to the invention, a walking aid is provided with a device for length adjustment by means of a control element on a handle of the aid. Specifically, such a walking aid can be designed as a supportive or relieving walking aid, for example as a walking stick, cane, multi-legged walking aid, crutch, forearm crutch or forearm support, axillary crutch or axillary support, or arthritis walking aid. However, a walking frame or walking aid, such as a walking frame or rollator, can also be designed according to the invention. For example, similar to the classic design by Émile Schlick or Louis Lucien Lepoix (FR479036A, US1244249A).

[0015] The walking aid consists of a main tube and an adjustable tube that can be moved longitudinally relative to it. These tubes can be moved within each other or telescopically to change the length. Depending on the design, the adjustable tube can be moved longitudinally within the main tube, or vice versa. The main tube and adjustable tube can be locked or released relative to each other using the length-adjustment mechanism. This allows the length of the walking aid, specifically the length between the handgrip and the ground, to be fixed in at least two defined positions and released to change between them.

[0016] According to the invention, this device has a slider which is movable by means of a mechanism from the remotely arranged control element. This slider has a transition from a first plane to a second plane, essentially orthogonal to its direction of movement.

[0017] Furthermore, according to the invention, the device has an engagement element which is activated by actuating the slider. into a locked position in the area of ​​the first level - in which the engagement element engages in a recess or indentation of the adjusting tube, in particular forcibly engages, - or, into an unlocked position in the area of ​​the second level - in which the recess or indentation of the adjusting tube can be released by the engagement element, in other words, in which the engagement element does not forcibly engage in the recess or indentation, but can be brought into position, e.g., loosely or with play.

[0018] In other words, a preferred embodiment of the slide valve has a first plane and a – preferably continuous – transition to a second plane. These planes need not necessarily be planar, but are primarily defined by being substantially parallel to the main tube. "Substantially parallel" here includes, in particular, a slight inclination of a few degrees, which is designed to provide a locking mechanism to prevent release under load (clamping or self-locking under load between the main and adjusting tubes) – for example, less than 5 degrees, or preferably less than 3 degrees, in the direction that provides this locking mechanism.

[0019] The engagement element can be, in particular, a rolling element, specifically, for example, a cylindrical roller or a ball. With such a design, the transition between engagement and release can be advantageously achieved, especially with little or no risk of jamming, tilting, or snagging, and with minimized friction, thus requiring little or no force for engagement / release. Specifically, unlike a bolt or similar component, this eliminates the need for a separate element that applies a restoring force to the engagement element, reducing the design and number of components, as well as preventing wear and breakage. This increases reliability.

[0020] The transition can preferably be continuous, i.e., a "flowing" transition between the two planes, for example in the form of a slope, inclined plane, curve, etc., and advantageously not, for example, in a rectangular step. This improves the actuation of the engagement element, in particular by preventing jamming, sticking, or the like – and thus increasing reliability.

[0021] The mechanism can preferably be a purely mechanical one, i.e., without any electrical, pneumatic, or hydraulic components (i.e., electrically or pneumatically / hydraulically independent), for example, using mechanical pull or push rods, levers, cables, pulleys, gears, etc. This allows for operation without a power supply and with little to no maintenance. The valve can preferably be attached to the main pipe or be displaceable relative to it via the mechanism.

[0022] The invention allows a user of the walking aid to safely and reliably release or lock the length locking mechanism of the walking aid from the handle as needed. The load-bearing capacity remains reliably maintained in the locked position. Specifically, the device used according to the invention can be compactly and space-savingly attached to or within the walking aid. Last but not least, its simple mechanical design ensures the necessary reliability and low maintenance, resulting in an efficient and cost-effective design with few or no expensive special parts.

[0023] In the preferred embodiment, the main tube can have a larger cross-section than the adjusting tube, i.e., the adjusting tube can be inserted into the main tube, whereas in another embodiment according to the invention, the main tube can also have a smaller cross-section than the adjusting tube, i.e., the main tube can be inserted into the adjusting tube.

[0024] Preferably, according to the invention, the upper tube (further from the ground) has a larger cross-section than the lower tube (closer to the ground). Preferably, the upper tube is the main tube. Alternatively, in another embodiment, the adjustable tube can also form the upper tube (see also the preceding paragraph). This allows for an advantageous geometry, e.g., with regard to statics and / or ergonomics.

[0025] In a specific embodiment, the actuating force can be applied via a rope, Bowden cable, or other cable, which is routed inside the walking aid or tube, thus remaining inaccessible and invisible from the outside. The locking mechanism, however, can still be located at least partially outside the upper tube and mechanically connected to the internal rope. This saves space within the tube and allows for the use of an internal gas spring. In addition to the compact design and aesthetically pleasing appearance, the components are also protected.

[0026] Preferably, the slide valve is designed and arranged such that it moves parallel or substantially parallel to the main pipe, or axially along a longitudinal direction of the main pipe. This could involve, for example, a linear displacement of the slide valve in the direction of the pipe axis, or a movement occurring substantially in the direction of the pipe axis, such as by tilting a slide valve about a rotational axis by a small angle of, for example, less than 20 degrees, which is virtually equivalent to a linear movement, or by rotating a round slide valve about the pipe axis, which, viewed tangentially to the engagement element, is also equivalent to a linear movement. In all these movements, as mentioned above, a transition occurs from the first to the second plane, which planes are defined by their different distances from the pipe axis in the radial direction and perpendicular to the pipe axis, respectively.This allows for the engagement of the first or second level with a simple movement controlled by a user interface element. These movements also enable reliable movement without the risk of tilting or jamming.

[0027] In another embodiment, the planes according to the invention can also form a transition between two different radii of a round slide, which is moved / rotated between these two planes about the tube axes between locked and released positions by actuating the control element on the handle.

[0028] In particular, the slide can be pre-tensioned into the locked position by a spring element. This pre-tensioning can be applied directly or locally to the slide, or, in another design, indirectly or remotely via the mechanism. This ensures that, when not in use and in all spatial orientations, the secure, locked state is always assumed as standard practice or whenever possible.

[0029] In one embodiment, the engagement element can be held loosely in a cage; in particular, the engagement element is held in a position within the area of ​​the adjusting tube where the recesses or indentations are located. Specifically, the slide can also be designed such that it holds the unlocked engagement element in position. This allows the engagement element to be held loosely and freely movable while simultaneously ensuring that it is always in a specific position.

[0030] According to the invention, the locking device can also be provided on two or more sides of the main / adjustable tube, preferably symmetrically or evenly distributed around the circumference of the tubes, or adapted to the load during use of the walking aid - which increases, for example, stability, safety, reliability, etc.

[0031] Preferably, the device can be arranged at the end of the main tube furthest from the handle. This ensures secure locking in both the fully extended and fully retracted positions – and, if provided, also in between.

[0032] The mechanism can, for example, be designed with a cable pull inside the main tube, by means of which the slider is actuated / moved. The cable pull can run, in particular, between the main tube and the adjustment tube. This ensures that it is protected inside the walking aid. Furthermore, this also allows a spring element, which will be described later, to be housed inside the walking aid as well.

[0033] The control element can be directly connected to and act upon a previously mentioned cable or Bowden cable in order to mechanically move the slider directly via this cable.

[0034] Preferably, the operating element can directly and mechanically actuate the movement of the slider via a lever arrangement inside the handle, using a linkage and / or a cable or Bowden cable. Optionally, the lever arrangement can incorporate a safety lock to prevent unintentional unlocking or actuation. In one embodiment, for example, a two-point operation can be provided, requiring the simultaneous actuation of two spatially separated operating elements for unlocking. In another embodiment, the safety lock can be designed such that actuation is only possible with a combined movement, e.g., pushing + sliding or turning + pushing, or the like.For example, a safeguard against accidental activation can be achieved by additionally spring-loading the thumb slider, requiring it to be pressed in before being pushed backward (or forward) to release that direction of movement.

[0035] The operating element can be positioned laterally on the handle of the assistive device in such a way that it can be operated by the user with their fingers, preferably with their thumb, while holding the handle. Such a laterally positioned thumb slider allows for ergonomic operation with a closed hand, i.e., while maintaining a secure and firm grip on the handle.

[0036] In one embodiment, the handle can be designed with an interchangeable outer grip shell. The replacement can include the part of the control element that comes into contact with the hand, or the entire control element can remain attached to the walking aid during the replacement process. This allows for adaptation to the ergonomics of the user's hand, left- or right-handed use, hand size, wear and tear, etc. For example, a handle shape individually adapted to the user can be provided, e.g., based on a hand scan or impression, by means of 3D printing, a mold, a casting, or machining. The grip shell can be attached via a quick-release mechanism such as a plug-in, magnetic, or simple screw connection to enable rapid exchange of different variants (size and shape).

[0037] In one embodiment, the handle can be designed without a grip shell, featuring a mirror-symmetrical design – specifically symmetrical about its central vertical surface – thus creating an interchangeable thumb slider side. This allows, for example, the same walking aid to be configured for right- or left-handed use. Therefore, the walking aid is versatile in its essential technical components without requiring any product variations.

[0038] Preferably, the main and / or adjusting tube can have a non-circular cross-section in addition to a circular one. Specifically, the adjusting tube has a flat cross-section in the area of ​​the engagement element – ​​meaning that the engagement element moves or rolls on the flat area when its length changes. In particular, the main and / or adjusting tube can have an oval, elliptical, or compressed circular cross-section, which is flattened at the main vertices. An oval tube profile with flat end faces offers advantages such as: sufficient space inside the tube for steel cables, Bowden cables, or other mechanisms for transmitting movement between the handle and the slider. This is especially beneficial if a spring element, e.g., a spring mechanism, is also located inside.While a mostly circular gas spring or coil spring is housed within the tube, a non-circular cross-sectional shape provides sufficient space for a mechanical connection between the slide and the actuating element. Specifically, space is also available on two essentially opposite sides of the tube cross-section, allowing for a locking mechanism to be implemented on both sides, which increases stability, safety, reliability, etc.

[0039] Such a non-circular tube cross-section also offers high bending stiffness around the x-axis - i.e., in the vertical walking direction - thus providing a low weight and slim design for the tubes of the walking aid, as well as space inside the tubes for the mechanics of the device according to the invention in synergy with a high mechanical load-bearing capacity tailored to the usual use.

[0040] Such a non-circular pipe cross-section also provides protection against twisting of the main pipe and the adjustment pipe relative to each other. Besides ensuring safety while walking, this also supports reliable engagement of the locking mechanism.

[0041] Especially in embodiments with an engagement element in the form of a roller, e.g., a cylindrical roller which partially engages in a horizontal slot for locking, a flattened or planar cross-sectional area enables straight contact surfaces of the rollers. This can, for example, reduce the resulting material stresses or allow for a smaller dimension.

[0042] The flattened or flat cross-sectional area or sides can also provide an advantageous, integrated guide surface for sliding blocks and / or the engagement element, which can result, for example, in an increased service life with daily extension and retraction.

[0043] Embodiments with (circular) round tubes can also provide an embodiment of the invention. In these cases, for example, the slide can also be at least partially or completely round. The movement of the slide can generally—and specifically in this case—be effected by tilting it by a small angle about a substantially horizontal axis of rotation, or by rotating the slide about a longitudinal axis of the tube, by means of which, according to the invention, a change is made between the at least two different planes acting on the engagement element.

[0044] According to the invention, a single engagement element can be provided for each walking aid, but preferably several engagement elements are provided on each main or adjustable tube. For example, two engagement elements can be provided, specifically one engagement element on each side of the adjustable tube. Preferably, one engagement element can be arranged on opposite sides of the tube, specifically on the two opposite, flat sides of the main or adjustable tube. Preferably, these multiple engagement elements on one tube can be operated by means of the same slider. Thus, by using two or more rollers, improved locking and / or redundancy against failure can be achieved, or better load distribution can be effected, with lower forces, longer service life, or smaller dimensions.

[0045] Preferably, in a walking aid according to the invention, a spring element is arranged inside the main tube and the adjustable tube, by means of which the main tube and the adjustable tube are slidably connected to each other. The spring element can be designed and arranged such that the change in length of the main tube relative to the adjustable tube in an unloaded state is brought into an expanded preferred position. For example, a fully extended position of the spring element can correspond to a maximum length detent position of the locking device, and / or a fully retracted position of the spring element can correspond to a minimum length detent position of the locking device. The spring element is designed such that it can be compressed by the user to the lowest detent position by applying pressure to the handle, and when the pressure is released or only very lightly applied, the walking aid extends to the uppermost detent position.For example, the minimum required force for compression can be less than approximately 15 kg, preferably less than approximately 6 kg, and the low force at which extension begins can be, for example, less than 4 kg or 2 kg or less. This improves the reliable extension and retraction of the walking aid's length.

[0046] In one embodiment, a stronger spring force can optionally be provided, which offers the user stronger feedback or support when getting up, for example, depending on user preference, a load during extension of <4 kg or <15 kg.

[0047] Preferably, the spring element is designed as a gas spring. This can be configured with a damped or limited extension speed. Additionally or alternatively, it can also be designed with a force profile that remains essentially constant over the entire travel. Optionally, the spring element can also be configured with different compression strengths or force requirements, or the walking aid can be designed for easy replacement of the spring element. For example, it can be disassembled between the main tube and the adjustment tube, preferably with minimal effort, e.g., without tools or using only a few screws, etc. For example, the spring element or gas spring can be mounted using a spherical or cylindrical bearing, which allows for quick and easy assembly as well as torque-free operation.This allows the walking aid to be used easily and flexibly adapted to user needs without having to provide a wide range of different walking aids.

[0048] Preferably, in an alternative embodiment, the spring element can be designed with compression springs, for example, coil springs. In addition to a single, long compression spring, a serial arrangement of at least two individual compression springs is particularly suitable. This provides a less complex and more cost-effective solution compared to a gas spring. For example, the walking aid can also be designed such that the gas spring or the conventional compression spring can be interchanged as desired, for example, as different product variants or upgrades. Reliable guidance inside the walking aid can be provided by sliding elements / rings along the length of the spring or by sliding elements / rings connecting the individual compression springs, thereby reducing kinking, tilting, or friction of the spring inside the adjustment and / or main tube.

[0049] Preferably, the walking aid can be designed such that at least one further intermediate locking position of the device is provided or formed between the maximum and minimum length adjustment of the walking aid. Specifically, the adjustable tube can have more than two recesses or indentations for discrete, different length adjustments, for example, 3, 4, or 5 discrete length settings. This makes it easier to stand up from different heights.

[0050] Preferably, the slider and / or the handle can provide or be connected to an externally visible optical indicator. This indicator shows whether the length adjustment is in the locked and / or unlocked position. For example, the slider's position can be made visible to the user of the walking aid via an indicator element, a viewing window, or the like. This provides additional safety for the user and ensures that the reliable operation of the length adjustment is clearly visible from the outside.

[0051] Preferably, in one embodiment of the walking aid, the handle is arranged at the end of the main tube. Alternatively or additionally, a sleeve tube with a sleeve or an underarm support at its free end can be arranged above the main tube at the handle. The sleeve tube can also be angled or bent relative to the main tube. Particularly when the device is arranged at a lower end of the main tube, or at an end opposite the handle, sufficient length adjustment and, at every walking aid length, a sufficiently long overlap between the main tube and the adjustable tube for stability can be provided – which would not be the case, for example, with a locking mechanism in the area of ​​the handle.

[0052] Preferably, in one embodiment, at least the adjusting tube or the main tube is formed in two parts, with a foot tube that can be moved therein and locked into place locally at least in discrete steps.

[0053] For example, the foot tube can be arranged inside the adjustment tube and can be locked into holes in different base length positions by means of a locking spring, spring lugs, spring nipple, spring pressure piece, clip / pin, screw, rotary clamping system, quick release, toggle lever, etc.

[0054] Specifically, a foot can be attached to the free end of the adjustable tube, opposite the main tube. This foot can function as a ground buffer or stick buffer, for example in the form of a rubber foot or spike, or as a multi-footed device, such as a tripod, quadruple, etc., to provide additional stability.

[0055] In other words, the walking aid provides a double telescopic tube system.

[0056] One of these telescopic mechanisms – preferably the lower one – can be locked locally and permanently and serves for a one-time adjustment of the basic length to the user's body size, similar to conventional crutches, e.g., with spring-loaded nipples, screws, knee levers, pins, screws, quick adjustments, etc. The second telescopic mechanism – preferably the upper one – can be locked or released from the handgrip according to the invention and serves for quick length adjustment, e.g., via a gas spring when standing up, sitting down, etc.

[0057] Similarly, the invention also relates to a method for changing the length of a walking aid by means of a handle-operated element. Specifically, such a walking aid can be designed as described in this document; however, the method according to the invention can also be applied to walking aids with different structural designs, especially if it includes the minimal, essential elements of a device according to the invention in the form of the slider and the engagement elements.

[0058] The inventive method comprises at least: Actuating a control element on the handle of the walking aid, preferably laterally actuating with a thumb, moving a slider located remotely from the handle by actuating the control element via a mechanism, in particular wherein the movement is effected by actuating with a purely mechanical transmission, releasing an engagement element from a detent position in an adjustment tube of the walking aid by the slider, moving the adjustment tube relative to a main tube to another detent position which corresponds to a different length of the walking aid, ending the actuation of the control element and moving a slider back with a forced engagement of the engagement element in the other detent position.

[0059] Preferably, when the walking aid is unloaded, a spring element inside the walking aid moves it into an expanded length under pre-tension. This makes it easier to use and stand up.

[0060] Further advantages, features and details of the invention will become apparent from the following description, in which exemplary embodiments of the invention are described with reference to the drawings.

[0061] The list of reference numerals, like the technical content of the patent claims and figures, forms part of the disclosure. The figures are described coherently and comprehensively. Identical reference numerals denote identical components; reference numerals with different indices indicate functionally identical or similar components.

[0062] This shows: Fig. 1ab or 1legs embodiment of a walking aid according to the invention in extended or retracted state, Fig. 2a, 2b and 2c an embodiment of a walking aid according to the invention in side view, rear view and top view, Fig. 3a, 3b and 3c a sectional view of an embodiment of a walking aid according to the invention with a locked actuating mechanism and detailed views thereof, Fig. 4a, 4b and 4c a sectional view of an embodiment of a walking aid according to the invention with a released actuating mechanism and detailed views thereof, Fig. 5a, 5legs detailed view of further embodiments of a spring arrangement of a walking aid according to the invention, Fig. 6a, 6legs detailed view of a first further embodiment of an actuating mechanism of a walking aid according to the invention, Fig. 7a, 7legs detailed view of a second further embodiment of an actuating mechanism of a walking aid according to the invention, Fig.8a, 8bein Cross-section of an embodiment of the main or adjusting tube with actuating mechanism. .

[0063] Fig. 1a Figure 1 shows an example of a generic walking aid 30, shown here in an exemplary embodiment as a forearm crutch. According to the invention, this walking aid is designed with a length adjustment 40, which can be operated by a control element 1, shown here in an exemplary embodiment as an actuating element in the form of a thumb slider, on the handle 35 of the walking aid. Here, the walking aid 30 is shown in its maximum extended state 30a, in which the device 32 – which forms a locking mechanism for the length adjustment 40 and is operated via the actuating element 1 on the handle 35 – locks in the uppermost length position 33a by means of an engagement element engaging in the recess or indentation 33a.

[0064] Fig. 1b The walking aid shows 30 from Fig. 1a In the retracted state 30b of the length adjustment 40, the device 32 locks in the lowest length position 33b in a locked position by engaging the engagement element in the recess or indentation 33b. According to the invention, at least two discrete length positions 40 or steps with two detents or recesses or indentations 33a, 33b are provided; optionally, one or more, for example, two or three such intermediate steps 33c can also be provided. However, according to the invention, no length adjustment 40 of the walking aid 30 to the user – which advantageously provides many intermediate steps to offer a high degree of variability – is provided by the device 32 according to the invention. According to the invention, the length adjustment 40 is carried out with the device 32 in exactly 2 (or possibly 3, 4 or 5) discrete steps 33a, 33b, 33c in order to provide a sitting or standing position / length 30b as well as a standing position / length 30a.Optionally, one or two intermediate positions / lengths 30c may be provided to accommodate different seat heights, for example. Preferably, no finely graduated length adjustment is provided between these positions; on the contrary, such fine gradation could even be considered detrimental to the primary function of the invention. The length adjustment 40 (min-max) according to the invention is, for example, more than 15 cm, for example, approximately 20 cm to 40 cm, specifically, for example, approximately 25 cm, and / or preferably, by way of example, more than 5 cm or more between the detents 33.

[0065] In Fig. 2a Figure 1 shows a side view of a walking aid design 30, with a handle 35 featuring an exemplary embodiment of a control element 1, which is attached to or above a main tube 11. In this example, a cuff tube 14 with a cuff 13 is also attached above the handle 35 or main tube 11; however, these are optional and not required in other embodiments. For ergonomic reasons, the cuff tube 14 is inclined backwards relative to the main tube 11 and is not a straight extension above it. Alternatively, a forearm support, axillary support, or other device could be provided in another embodiment.

[0066] In the area of ​​the lower end of the main tube 11, facing away from the handle 35, the device 32 is arranged, which provides a connection according to the invention, which can be released or engaged via the handle, between the main tube 11 and the adjusting tube 15.

[0067] A foot section 4 is attached to the lower part of the walking aid 30, which interacts with the ground; in this example, a rubber foot in the form of a floor buffer. Other versions may also have a spike or other anti-slip device, or even a multi-legged design, e.g., a three-legged, four-legged, etc.

[0068] This figure also shows the optional, preferred variant of double telescoping, with an additional foot tube 16 at the very bottom, at the lower end of the adjustment tube 15. These two tubes are designed to lock into fixed positions relative to each other and are only locally adjustable – for example, as known from classic crutches with spring-loaded nipples or balls that engage in holes and must be pressed in locally by hand for adjustment. This allows for adjustment to the user's height, preferably in smaller increments than with the device 32, specifically less than 5 cm, e.g., approximately 2 cm, 2.5 cm, 3 cm, or 4 cm. These are shown in the rear view of the walking aid 30. Fig. 2b clearly visible once again.

[0069] In Fig. 2b This is a rear view of a walking aid model 30. Fig. 1a shown. The labeled elements correspond to those explained previously or elsewhere.

[0070] In Fig. 2c is a floor plan or top view of a walking aid design 30 of Fig. 1a or Fig. 2b The labeled elements correspond to those explained previously or elsewhere. Explicitly shown here is an embodiment in which the handle 35 optionally features interchangeable handle shapes, for example, with interchangeable left-hand grip 8 and right-hand grip 9 on a single handle core. This allows the same walking aid to be quickly and easily adapted to the specific grip requirements or preferences of different users, e.g., right-handed or left-handed users. Preferably, the operating element 1, or more specifically its internal actuation mechanism within the handle core, is designed such that it can be operated from multiple positions, particularly from the left or right, using the external operating element 1.

[0071] In one embodiment, the operating element 1 can be secured against unintentional activation. For example, activation may require a sufficiently large force so that unintentional contact is insufficient to trigger it, or a combined movement such as pushing and sliding, turning and sliding, turning and pushing, or similar, or a two-element operation may be required to activate the operating element at all. In another embodiment of a variant for securing against unintentional retraction, the slope of the slide surface 18a can also be selected such that, under load, the cylinder roller pushes the slide 18 towards the locked position and thus securely locks it – in the example shown, upwards.

[0072] Fig. 3a shows a sectional view of an embodiment of a walking aid according to the invention 30 - similar Fig. 2a In addition to the elements already described, a spring element 5 – shown here in the embodiment of a gas spring 5 – is shown inside the walking aid 3. This spring element extends the walking aid 30 to its maximum length when unloaded or loaded below a threshold value, with the device 32 unlocked. Optionally, the speed and / or force of the movement by the spring element 5 can be predetermined or adjusted in a defined manner. In this example, the gas spring 5 is mounted at the top and / or bottom by a ball socket 12. The gas spring 5 is connected via a spring clamp 3 to the main tube 11 or the handle 35, and to the adjustment tube 15. In addition to the spring element 5, a cable 21 or a pull rod is also shown inside as part of the mechanism for moving the slider of the device 32.

[0073] In the detailed view in Fig. 3b out of Fig. 3a The handle 35 is shown enlarged again. In this exemplary embodiment of the mechanism – by means of which the slide is moved away from the main tube, in particular around a corner between the main tube 11 and the handle 35, when the control element 1 is actuated – the control element 1 and the associated mechanism are shown here in the locked position of the device 32a – i.e., with the control element 1 not actuated. Within the scope of the invention, the mechanism can also be designed differently, but preferably it is purely mechanical, i.e., it functions without electrical, pneumatic, or hydraulic elements. In the example shown, inside the handle core 10, a pressure rod 2 connected to the control element 1 (not shown) acts on a rocker 23, with which a pull cable 21 – in this example, two pull cables 21 – can be moved over a balance 22, i.e., a pull can be exerted on the cables 21. In the shown locked position, the mechanism is shown in the locked position.In the locked state, ropes are preferably taut, but not tightened.

[0074] In the detailed view in Fig. 3c out of Fig. 3a The device 32a, attached to the main tube 11, is shown in the locked position, i.e., with the operating element 1 not actuated. In this state, the engagement element 17 engages—in the exemplary embodiment shown, on two sides, in other embodiments possibly only on one side—in a recess or indentation of the adjusting tube 15, thus locking them against each other. The cable 21, which in this example is connected to the slide 18 via a pull plate 24, is not pulled (upwards), and the slide 18 is not actuated, so that its first slide plane 18a interacts with the engagement element 17, forcing the latter into the locked position. The engagement element(s) 17 can be held loosely in a cage of the device 32. The slide is mounted in a slide housing 20 of the device 32, which is closed with a slide cover 17.In this example, this slide housing 20 also forms sliders 7 for the adjusting tube 15.

[0075] When the control element 1 is actuated, the rocker 23 is actuated via the pressure rod 2, which raises the scale 23 and thus pulls the rope 21 upwards. In the device, the rope 21 also moves the slide 18 upwards via the pull plate 24, whereby, instead of the first level 18a, the second level 18b interacts with the engagement element 17 via the transition 18c – and thus the adjusting tube 15 is released relative to the main tube 11.

[0076] This is also shown again in the following series of figures 4a, 4b, 4c, which show similar representations to the series of figures 3a, 3b, 3c - but in the unlocked state, with operating element 1 activated. The labels are analogous to previous figures.

[0077] Fig. 4a shows a sectional view of an embodiment of a walking aid 30 according to the invention as in Fig. 3a - however, in the unlocked state, as already described.

[0078] The detailed view Fig. 4b shows handle 35b in comparison to Fig. 3b in unlocked position.

[0079] The detailed view Fig. 4c shows device 32b in comparison to Fig. 3c also in the unlocked position. In this case, the level 18b of the slider 18 releases the engagement element 17, and this no longer engages forcibly in the recess or indentation 33 of the adjustment tube 15 - but releases it for adjusting the length of the walking aid 30.

[0080] Preferably, the slide 18 is biased into the locked position of 18a by a spring or similar device (not visible here). For example, the slide 18 can be pressed downwards into a rest position by compression springs. After unlocking and moving the adjusting tube 15 relative to the main tube 11, so that the engagement element 17 is not positioned over the indentation or recess 33 of the adjusting tube 15, the operating element 1 can be released. When the adjusting tube 15 is moved to a different position, the engagement element 17 automatically locks into place by re-engaging there.

[0081] The engagement element 17 is preferably a roller element, e.g. a cylindrical roller (=shown) or a ball, etc. This enables engagement and release with advantageously low force and low tendency to tilt.

[0082] As shown in the example, the transition 18c between the two planes is preferably continuous, i.e., not a rectangular step, but a smooth transition, e.g., in the form of an inclined plane, a curve, a rounded section, etc. This reduces the tendency for tilting and the force required. The planes 18a and / or 18b are not necessarily perfectly flat surfaces; rather, the term "flat" here refers more to the concept of a floor, i.e., a different distance from the main tube or adjustable tube side wall. In one embodiment, these planes may, for example, have a slight inclination relative to the tube side wall, i.e., be somewhat slanted or even curved.

[0083] In Fig. 5a Figure 1 shows a section of a partial sectional view of a walking aid design 30 in a region of the spring element 5. In this design, a spring element 5 is shown inside the main tube 11 and the adjustment tube 15, instead of (or possibly in addition to) the previously described gas spring 5. In this design, the spring element 5 is formed from a series arrangement of several individual springs 52, shown here as coil springs 52. Besides an alternative variant using a single, long spring, the series arrangement allows for simpler and more secure guidance of the spring(s) inside the tube, without or with reduced rubbing, tilting, kinking of the spring within the tube, or unintentional jamming of the pull rod or cable 21. The individual springs 52 are connected to each other by double-sided spring guides 53 and supported against the tube 11.A single-sided spring guide 51 can be located at the ends of the series arrangement. The spring guides 51 / 53 also form, in particular, a defined guide or protection for the tension rod or the cable 21.

[0084] Fig. 5b shows a sectional view of an embodiment of a walking aid 30 according to the invention as in Fig. 5a The following images show details that are more clearly visible. The labeled elements correspond to those explained previously or elsewhere.

[0085] In Fig. 6a This is an embodiment of the slide 18 in which its movement between the engagement of the first plane 18a or second plane 18b – i.e., the displacement of the slide – is achieved by a tilting or rotating movement about a pivot point. Preferably, the angle of the slide movement is small, e.g., less than 30 degrees. (Every movement can be considered a rotation about an instantaneous center of rotation, which may also be located at infinity.)

[0086] In the illustrated embodiment, only a single pull rope 21 is used as an example. Furthermore, in the illustrated embodiment, only a single locking mechanism is provided on one side of the tubes, and not an opposing, double locking mechanism as in Figs. 3 and 4 .

[0087] In a sliding housing 20 of the device 32, which is closed by a sliding cover 19, the sliding element 18 is designed as a tiltable or rotatable element. The sliding element 18 has: a first level 18a – which holds the engagement element 17 in a recess 33 of the adjusting tube 15 in a positively locking manner; and a second level 18b – which releases the engagement element 17, and thus the adjusting tube 15, so that the length adjustment of the walking aid is enabled. There is a corresponding transition between the levels. Also labelled here are a cylinder 74 and a piston 73 or piston rod 73 of a gas spring 5.

[0088] In Fig. 6b is another view of a walking aid design 30 of Fig. 6a shown. The labeled elements correspond to those explained previously or elsewhere.

[0089] As exemplified in Fig. 7a The elements shown can also be arranged and used in reverse / mirror-image configurations within the scope of the invention. Specifically, in other embodiments of the invention, inside and outside or top and bottom can be interchanged. For example, in this embodiment – ​​contrary to the previous one – the main tube 11 is arranged inside the adjusting tube 15. Functionally independent of this, the device 32 with the engagement element 17 and the slide 18 is arranged inside two tubes 15 and 11 in the illustrated variant. The slide 18 is designed here in the basic form of a hollow cylinder.In the locking block 71, in which the slide 18 is moved, a spring 72 is also shown, which holds the slide 18 in a locked rest position. In this position, the first plane 18a of the slide engages the engagement element 17 – here a ball 17 – in the recess 33 of the adjusting tube 15, thus locking the main tube 11 and the adjusting tube 15 against each other. If the slide 18 is moved so that the plane 18b of the slide 18 interacts with the engagement element 17 (not shown), the adjusting tube is released, and a change in length is possible. There can be one, two opposing, or even more engagement elements 17, which are preferably held loosely in a cage of the device 32.

[0090] These embodiments of Figs. 6a, 6b und Figs. 7a, 7b is particularly suitable for circular main tubes 11 and / or adjustable tubes 15.

[0091] In Fig. 7b is another view of a walking aid design 30 of Fig. 7a shown. The labeled elements correspond to those explained previously or elsewhere.

[0092] In Fig. 8a is similar Fig. 2a to indicate the position of the following sectional view A - A through the device 32 of an embodiment.

[0093] In Fig. 8b An embodiment of the previously marked section through the device 32 is shown. Separated by a break line, the locked device state 32a is shown in the left half of the figure and the unlocked device state 32b in the right half during the length change 40.

[0094] In the locked state 32a, the engagement element 17 – here a cylindrical roller 17 – engages in a recess 33 of the adjusting tube, which recess 33 preferably has a lower height than the diameter of the roller element 17. Due to the first level 18a of the slide 18, which is engaged here, the engagement element 17 is forced into place, and the main tube 11 is locked relative to the adjusting tube 15. This locked position of the slide 18 results from the operating element 1 on the remotely arranged handle 35 not being actuated and is preferably transmitted via a mechanical, in particular a purely mechanical, mechanism.

[0095] In the unlocked state 32b, the engagement element 17 does not necessarily engage in a recess 33 of the adjusting tube, but is loose or free and can leave the recess when the two tubes move or are forced relative to each other. This is because the second level 18b of the slider 18 is now engaged, allowing the engagement element 17 to do so. The engagement element 17 then rests against the outer surface of the adjusting tube 15 (along a section without a recess 33), or rests loosely against it. This unlocks the main tube 11 relative to the adjusting tube 15, allowing the length of the walking aid to be changed. This unlocked position of the slider 18 is achieved by actuating the control element 1 on the remotely located handle 35 and is preferably transmitted via a mechanical, and in particular a purely mechanical, mechanism.

[0096] It is obvious to the person skilled in the art that the embodiments and approaches shown or described here in different figures can also be combined and exchanged differently than shown, in accordance with the invention. Bezugszeichenliste

[0097] 1 Control element, actuating element, thumb slider, switch, knob, lever 2 Push rod 3 Spring mounting bottom 4 Foot, rubber, anti-slip, spike 5 Gas pressure spring, spring element 6 Slider top 7 Slider bottom 8 Handle shell left 9 Handle shell right 10 Handle core 11 Main tube 12 Ball pocket 13 Cuff (optional) 14 Cuff tube (optional) 15 Adjustment tube, center tube, inner tube 16 Tube bottom, foot tube 17 Roller 18 Slider, rocker slider 18a First slider level (locked) 18b Transition first-second slider level 18c Second sliding level (released) 19 Sliding cover 20 Sliding housing 21 Steel cable, rope, pull bar 22 Scale 23 Rocker 24 Pull plate 30 Walking aid, walking stick, crutch, standing aid, 30a Walking aid extended (maximum length) 30b Walking aid retracted (minimum length) 32 Device, locking mechanism 33 Length positions, steps, detents, adjustments.35 HANDLE 40 LENGTH ADJUSTMENT 51 SPRING GUIDE SINGLE-SIDED 52 SPRING 53 SPRING GUIDE DOUBLE-SIDED 71 LOCKING BLOCK 72 SPRING RELAXED 73 GAS PRESSURE SPRING ROD, PISTON ROD 74 GAS PRESSURE SPRING CYLINDER.

Claims

1. Walking aid (30), in particular walking stick, forearm crutch or axillary crutch, with a device (32) for changing the length (40) by means of a control element (1) on a handle (35) of the aid (30), designed with • a main tube (11) and • an adjustable tube (15) which is longitudinally displaceable relative to the main tube, which are displaceable into one another for changing the length (40), and which can be locked or released against each other with the device (32) for changing the length, characterized by the fact thatThis device (32) comprises: • a slide (18) which is movable from the remotely arranged control element (1) by means of a mechanism, in particular a mechanical one, and which has a transition (18c) from a first plane (18a) to a second plane (18b) essentially orthogonal to its direction of movement, in particular a continuous transition, and • an engagement element (17), in particular a roller element, specifically a cylindrical roller or a ball, which can be moved by actuating the slide (18) - into a locked position (32a) in the area of ​​the first plane (18a), in which the engagement element (17) engages in a recess or indentation (33) of the adjusting tube (15), or - into an unlocked position (32b) in the area of ​​the second plane (18b), in which the recess or indentation (33) of the adjusting tube (15) can be released by the engagement element (17).

2. Walking aid (30) according to the previous claim, characterized by the fact thatthe slide (18) is moved parallel to the main tube (11), preferably linearly or by tilting or by rotating, in particular wherein the slide (18) is biased into the locked position (32a) by a spring element (72), in particular wherein the engagement element (17) is held loosely in a cage, in particular in a position above the recess or indentation (33), or the slide (18) holds the unlocked engagement element (17) in position.

3. Walking aid (30) according to one of the previous claims, characterized by the fact that the device (32) is arranged at the end of the main tube (11) furthest from the handle (35) and / or the mechanism is designed with a cable pull (21) inside the main tube (11), in particular between the main tube (11) and the adjusting tube (15).

4. Walking aid (30) according to one of the previous claims, through this characterized thatThe operating element (1) actuates the movement of the slider (18) purely mechanically via a lever arrangement (22, 23) inside the handle (35), in particular wherein the lever arrangement (22, 23) forms a safety lock which protects against unintentional unlocking and / or in particular wherein the operating element (1) is arranged laterally on the handle (35) of the assistant (30) in such a way that it can be actuated by a user with the thumb when holding the handle (35).

5. Walking aid (30) according to one of the previous claims, through this characterized that the main and adjusting tube (11,15) have a non-circular cross-section, in particular wherein the adjusting tube (15) in the area of ​​the engagement element (17) is designed to be flat / planar in its cross-section (and the latter moves on it), in particular with an oval or elliptical or compressed circular cross-section, which is flattened at the main vertices.

6. Walking aid (30) according to one of the previous claims, through this characterized that Each engagement element (17) is arranged on one, preferably opposite, side of the adjusting tube (15).

7. Walking aid (30) according to one of the previous claims, through this characterized that a spring element (5) is arranged inside the main tube (11) and the adjusting tube (15), by means of which the main tube (11) and the adjusting tube (15) are slidably connected to each other, in particular wherein the spring element (5) brings the change in length (40) of the main tube (11) relative to the adjusting tube (15) in an unloaded state into an expanded preferred position, preferably wherein a fully extended position (30a) of the spring element (5) corresponds to a maximum length detent position (30a) of the device (32), and / or preferably wherein a fully retracted position (30b) of the spring element (5) corresponds to a minimum length detent position (30b) of the device (32).

8. Walking aid (30) according to one of the previous claims, characterized by the fact that the spring element (5) is a gas spring, in particular designed with a damped / limited extension speed and / or with a force profile that is essentially constant over the path.

9. Walking aid (30) according to one of claims 1 to 7, characterized by the fact that the spring element (5) is designed with a serial arrangement of at least two individual compression springs (52) which are connected to each other by sliding elements / rings (51, 52) and guided inside the walking aid (30), in particular with at least two coil springs.

10. Walking aid (30) according to one of the previous claims, characterized by the fact that at least one further intermediate detent position (30c) of the device (32) is provided / designed, in particular wherein the adjusting tube (15) has several recesses or indentations (33) for discrete, different length changes (40).

11. Walking aid (30) according to one of the previous claims, characterized by the fact that the slider (18) and / or the handle (35) provides or is connected to an externally visible indicator showing that it is in the locked position (32a) and / or unlocked position (32b).

12. Walking aid (30) according to the previous claim, characterized by the fact that the handle (35) is arranged at the end of the main tube (11) and / or a sleeve tube (14) is arranged over the main tube (11) on the handle (35) and with a sleeve (13) at its free end, in particular angled relative to the main tube (11) and / or an axle support is arranged over the main tube (11) on the handle (35).

13. Walking aid (30) according to one of the previous claims, through this characterized thatat least the adjusting tube (15) or the main tube (11) is formed in two parts, with a foot tube (16) that is slidable therein and can be locally engaged at least in discrete steps, preferably wherein the foot tube (16) is arranged inside the adjusting tube (15) and can be engaged in different base length positions by means of spring lugs in holes, in particular wherein a foot part (4) is attached to the free end of the adjusting tube (15) or foot tube (16), specifically a rubber foot or a spike.

14. Method for changing the length of a walking aid (30) by means of a handle control element (1), in particular in a walking aid (30) according to one of the preceding claims, comprising: - actuating the control element (1) on the handle (35) of the walking aid (30), preferably by lateral actuation with a thumb, - moving a slider (18) arranged remotely from the handle (35) by the control element (1) via a mechanism, in particular a purely mechanical one, - releasing an engagement element (17) from a detent position (33a) in an adjustment tube (15) of the walking aid (30) by the slider (18), - moving the adjustment tube (15) relative to a main tube (11) to another detent position (33b), - ceasing the actuation of the control element (1), and - moving a slider (18) back with a forced engagement of the engagement element (17) in the other Detent position (33b).

15. Procedure according to the previous procedure claim, through this characterized that A spring element (5) inside the walking aid (30) in an unloaded state moves the adjusting tube (15) preferably to an expanded length.

Images