Skid for stroller and wheelchair

Abstract

FIELD: mobility aids.SUBSTANCE: devices for enabling the movement of wheeled devices on snowy surfaces can be used to equip strollers and wheelchairs in winter. The stroller skid includes a support part and a fastening mechanism. The support part is made of plastic with a curved tail and front part, the fastening mechanism is made of plastic and mounted with a detachable connection on the outer surface of the support part, there are grooves along the entire support part. The guide grooves along the edges of the support part are deeper than the grooves made in the central part. The fastening mechanism comprises supports with guide recesses, a stop and a clamping lever with a plate, wherein hooks are made on the stop and knurling is made on the plate of the clamping lever, the supports with guide recesses are rigidly mounted on the support part, along the supports on the outer and inner sides there are adjustment scales for adjusting the stop relative to the plate of the clamping lever. The stop is mounted on supports opposite the clamping lever with a plate using adjusting screws and is made with the possibility of adjustment using the adjusting screws, and the clamping lever with a plate is hingedly fixed on the supports and is made with the possibility of rotating at an angle of up to 100 degrees, in addition, the plate of the clamping lever and the stop are mounted vertically oriented and made with recesses.EFFECT: flotation on snow cover is increased.1 cl, 3 dwg

Description

[0001] The invention relates to the field of mobility aids, namely to devices for ensuring the possibility of movement of wheeled devices on snowy surfaces, and can be used to equip children's strollers and wheelchairs in the winter period [B62B9 / 00, B62B9 / 04, B62B19 / 00, B62B19 / 02].

[0002] Adjustable ski device for wheeled vehicles is known from the prior art [US9950732B1, published 04 / 24 / 2018], comprising a ski device for mounting on the wheels of vehicles such as strollers and carts, including a support ski with curved ends and an adjustable mechanism for fastening to the wheel in the form of a clamping device with a quick release, allowing the device to be adapted to different wheel sizes and quickly mounted or dismounted without tools, wherein the fastening mechanism includes movable elements for fixing the wheel on the ski, ensuring the transition from wheeled movement to sliding on snow.

[0003] The disadvantage of this adjustable ski device for wheeled vehicles is that the supporting part of the ski is made smooth, without elements to improve traction, which leads to insufficient traction on the snow and the accumulation of snow under the ski, the fastening mechanism is made in the form of a cable clamp with a reel, which can weaken under load and vibration during movement, causing instability of the wheel fixation, slippage and loss of control, and as a result, reduces the cross-country ability of the stroller on snow cover.

[0004] Also known from the prior art are SKIS FOR A STROLLER [US2024109578A1, published 04.04.2024], comprising a sliding accessory for mounting on the wheels of a stroller, including an elongated support plate for sliding on snow with opposite sides defining a shoe, a receiving element for a wheel integrated with the shoe and defining a housing for receiving the lower part of the wheel, open upward and forward, limited by a bottom wall and two parallel side walls facing each other, wherein each side wall has a relief protruding towards the other, the reliefs interact with the tire by contact for relative movement between the accessory and the wheel, in which the tire is elastically compressed by the reliefs during the transition between the two configurations, providing a transition from wheeled movement to sliding on snow.

[0005] The disadvantage of these stroller skis is that the base plate is smooth, without elements to improve grip, which leads to insufficient grip on the snow and the accumulation of snow under the accessory. The fastening mechanism is made in the form of reliefs on the sidewalls, compressing the tire elastically, which can weaken under load and vibration during movement, causing instability of the wheel fixation, slippage and loss of control, and as a result, reduces the stroller's cross-country ability on snow cover.

[0006] The closest in technical essence is the Driving and Control Assistance Device for Unpaved Ground [EP2366370A1, published 09.21.2011], comprising a device for quickly mounting on wheels of two- or multi-wheeled vehicles, such as baby carriages or wheelchairs, including a housing for receiving a wheel and a ski with curved ends, allowing the vehicle to be controlled on an uneven, soft and loose surface, such as snow, wherein the wheel is lifted off the ground and centered in the housing on the surface of the ski for stable fixation, ensuring the transition from wheeled movement to sliding.

[0007] The main technical problem of the prototype is that the ski support part is made smooth, without elements to improve grip, which leads to insufficient grip on the snow and the accumulation of snow under the ski, the fastening mechanism is made in the form of a simple housing for receiving the wheel without an adjustable stop and a hinged clamping lever with a plate, which causes instability of the wheel fixation, slippage and vibration during movement, and as a result, reduces the cross-country ability of the stroller on snow cover.

[0008] The objective of the invention is to eliminate the shortcomings of the prototype.

[0009] The technical result of the invention consists in increasing the stroller’s cross-country ability on snow cover.

[0010] The technical result is achieved due to the fact that the ski for the stroller, including the supporting part and the fastening mechanism,

[0011] while the supporting part is made of plastic with a curved tail and front part,

[0012] The fastening mechanism is made of plastic and is mounted with a detachable connection on the outer surface of the support part,

[0013] grooves are made along the entire supporting part,

[0014] at the same time, guide grooves are made along the edges of the supporting part, made deeper than the grooves made in the central part,

[0015] The fastening mechanism contains supports with guide recesses, a stop and a clamping lever with a plate,

[0016] The stop is provided with hooks and the clamping lever plate is knurled,

[0017] The supports with guide recesses are rigidly mounted on the support part,

[0018] Along the supports on the outer and inner sides there are adjustment scales for adjusting the stop relative to the clamping lever plate,

[0019] wherein the stop is mounted on supports opposite the clamping lever with the plate using adjusting screws and is designed with the possibility of adjustment using the adjusting screws,

[0020] and the clamping lever with the plate is pivotally mounted on the supports and is designed to rotate at an angle of up to 100 degrees,

[0021] In addition, the clamping lever plate and the stop are mounted vertically and provided with recesses.

[0022] Brief description of drawings.

[0023] Fig. 1 shows a top view of the stroller ski.

[0024] Fig. 2 shows a right side view of the stroller ski.

[0025] Fig. 3 shows an isometric view of a stroller ski.

[0026] The figures indicate: 1 - support part, 2 - fastening mechanism, 3 - grooves, 4 - guide grooves, 5 - supports, 6 - stop, 7 - clamping lever, 8 - plate, 9 - adjusting screws, 10 - recesses, 11 - adjusting scales, 12 - hooks.

[0027] Implementation of the invention.

[0028] The stroller ski is designed to facilitate the movement of strollers, lightweight strollers, and wheelchairs on snowy surfaces. The stroller ski is an innovative assistive device that allows you to traverse packed snow on roads and sidewalks, preventing the wheels from sinking into loose or deep snow. The stroller ski is suitable for winter conditions where standard stroller wheels lose traction and maneuverability. It is not intended for extreme sports such as skiing or jogging, but is designed for everyday use, ensuring safety and comfort for parents and children.

[0029] The ski for the stroller includes a support part 1 and a fastening mechanism 2 (Fig. 1-3).

[0030] The stroller ski is structurally composed of two main functional modules that form a single unit: support part 1, which directly interacts with the snow cover, and fastening mechanism 2, designed for secure connection to the stroller wheel (Figs. 1-3). Support part 1 is the load-bearing element responsible for buoyancy and sliding, while fastening mechanism 2 ensures quick and secure installation on a standard wheel. These two components are rigidly connected, forming an adaptive system that transforms a standard stroller into a vehicle adapted for winter conditions. Their combined action redistributes the load and ensures stable contact with the snow surface, which improves the stroller's maneuverability on snow.

[0031] Support part 1 is made of polyoxymethylene, a thermoplastic polymer (plastic) with high strength and low friction. Its design includes a sliding flat surface designed for contact with snow, as well as curved front and rear ends. This shape effectively distributes the load from the stroller, preventing the wheels from sinking into loose or deep snow and ensuring a smooth forward motion.

[0032] The sliding flat part is made with a coefficient of sliding friction of the ski on snow in the range from 0.05 to 0.15, which is a low value that ensures easy and smooth sliding on the snow cover without significant resistance, while this coefficient is achieved through the use of polyoxymethylene, which has low adhesion to snow and ice, in combination with optimized surface geometry and the presence of longitudinal grooves 3, which minimize the contact area and contribute to the formation of a thin water film, and such a low coefficient of friction can significantly reduce the physical effort to move the stroller, increase maneuverability and provide a comfortable, energy-saving glide even on compacted or wet snow

[0033] Polyoxymethylene refers to a thermoplastic polymer of formaldehyde (POM), also known as polyformaldehyde or acetal, which is characterized by high rigidity, low coefficient of friction, outstanding wear resistance and dimensional stability, and excellent resistance to cold, making it an ideal material for the manufacture of the supporting part and the binding mechanism of the ski, since these properties directly contribute to easy gliding on snow, durability of the device when used in winter conditions, shape retention and strength at low temperatures, as well as providing the necessary structural rigidity with minimal weight.

[0034] Polyoxymethylene has the following advantages in increasing cross-country ability on snow cover: low coefficient of friction, ensuring easy and smooth gliding of the ski with minimal resistance; high rigidity and wear resistance, which guarantee the preservation of the shape and integrity of the supporting part under loads and contact with compacted snow, crust or ice; frost resistance, preventing brittleness and cracking of the material at low temperatures; low adhesion to wet snow and ice, which minimizes sticking and ensures stable gliding; low specific gravity, helping to reduce the overall weight of the device and facilitating maneuvering of the stroller, as well as moisture resistance and chemical inertness, eliminating corrosion, swelling or degradation of the material under conditions of contact with melted snow and reagents, which together ensures reliable, durable and efficient operation of the ski, significantly facilitating movement on winter roads.

[0035] The fastening mechanism 2 is made of plastic (polyoxymethylene) and is rigidly mounted with a detachable connection on the outer surface of the support part 1, for example, using a screw or bolt connection, providing a rigid connection with the support part 1 and preventing displacement during operation.The 2-piece mounting mechanism provides a clamping area for stroller wheels with a diameter of 150 mm to 300 mm and a width of 20 mm to 70 mm, allowing for universal adaptation of the ski to the vast majority of strollers, strollers, and wheelchairs, regardless of wheel type (solid, pneumatic, or spoked), ensuring reliable coverage and fixation of both narrow and wide tires; the adjustable configuration of the mechanism with the ability to fine-tune ensures a tight fit of the clamping elements to the wheel, eliminating play, slippage, and lateral displacement even when moving on uneven snow; such broad compatibility, combined with a quick, tool-free mounting system, makes the device convenient for everyday use, allowing the user to mount or remove the ski in seconds, which is important for ensuring mobility and safety in winter conditions for both parents with children and people with disabilities.

[0036] Support Part 1 has dimensions optimal for its intended function: length from 370 to 400 mm and width from 100 to 150 mm. This range of dimensions provides the necessary support area to effectively distribute the stroller's weight and create sufficient buoyancy on snow, while preventing unnecessary bulk. These dimensions are a compromise between stability, maneuverability, and versatility, allowing the device to confidently navigate snow obstacles while remaining compact and lightweight. Specific values ​​within these limits may vary depending on the intended stroller model and expected operating conditions, while maintaining the general operating principles.

[0037] The height of the assembled ski, ranging from 60 to 80 mm, is a key design parameter determining its profile and performance characteristics. This range is selected to ensure optimal ground clearance—the distance between the bottom of the support part 1 and the mounting unit—guarantees sufficient space for the standard stroller wheel to rotate freely and prevent contact with the snow surface. This height also creates a low center of gravity for the entire stroller-ski system, directly increasing stability and preventing tipping when traveling on uneven snow. Structurally, the height is determined by the thickness of the support part 1 itself and the height of the mounting mechanism 2 installed on it. This range maintains the necessary rigidity and strength of the entire structure while minimizing weight, ultimately contributing to ease of operation, portability, and storage.

[0038] The assembled ski for the stroller weighs no more than 0.7 kg, which minimizes the overall load on the frame and wheels of the stroller, maintaining its maneuverability and ease of control, ensures easy carrying, storage and quick assembly without significant physical effort, which is especially important for parents with small children or wheelchair users; the low weight of the structure, achieved through the use of lightweight and durable materials, does not add weight to the front axle of the stroller, preventing it from tipping over and ensuring stable movement on snow cover, and also helps reduce user fatigue during frequent installation and removal of the device, making its use as convenient and practical as possible in everyday winter conditions, which ultimately increases the comfort and safety of winter walks.

[0039] Longitudinal grooves 3 run along the entire base section 1, from the curved front to the tail. Their primary function is to ensure the ski's stability and straightness on the snow. Located along the entire length of the base, these grooves 3 create a structured relief that minimizes the area of ​​direct contact with the snow, thereby reducing adhesion and friction, resulting in a smoother and easier glide. Furthermore, grooves 3 effectively remove snow mass generated by the pressure of the carriage, preventing the formation of a snow wedge in front of the ski and reducing overall drag.

[0040] In addition to the main grooves 3, guide grooves 4 are located along the edges of the supporting section 1. Their key design feature is their greater depth compared to the grooves 3 located in the central section. This creates pronounced lateral support, which is important for improving directional stability. Guide grooves 4 actively interact with the denser and more compacted layers of snow at the edges of the track, preventing lateral slip (understeer) and skidding, especially on loose, uneven, or icy surfaces. Thus, the system of two groove types works synergistically: the central grooves 3 are responsible for reducing drag and snow removal, while the peripheral guide grooves 4 maintain directional stability and counteract lateral loads.

[0041] The geometry of grooves 3 is optimized for their functional purpose. Guide grooves 4 have a trapezoidal cross-section and a depth of 9 to 12 mm. This significant depth and shape ensure high mechanical strength of the groove itself and create effective lateral grip. The trapezoidal cross-section of guide grooves 4 promotes self-cleaning of adhering snow and ice and prevents compacted snow from becoming lodged. Grooves 3, which primarily serve as drainage and frictional aids, are rectangular in cross-section and 2 to 3 mm deep. This depth is sufficient to form the necessary air gap and drain meltwater, but does not weaken the structure of support part 1, maintaining its high flexural rigidity.

[0042] The fastening mechanism 2 is the key unit of the device, responsible for the reliable and quick fixation of the stroller wheel, its design includes three main elements: two supports 5 with guide recesses, an adjustable stop 6 and a clamping lever 7, combined with a pressure plate 8. The supports 5 serve as a supporting base and set the correct position of the wheel, while the stop 6 and the lever 7 with the plate 8 form an adjustable clamping system that covers the wheel from opposite sides.

[0043] Stop 6 is mounted on supports 5 opposite clamping lever 7 with plate 8 and is finely adjustable. This is accomplished using adjusting screws 9, which allow stop 6 to be moved along the supports, thereby changing the distance between it and plate 8 of the clamping lever. This feature is the basis for the mechanism's versatility, as it allows for precise adjustment of the gap to the specific wheel diameter and profile, ensuring its perfect centering in the mounting seat and creating the necessary preload for subsequent clamping.

[0044] The operation of the fastening mechanism 2 is based on the synchronous interaction of all its components. After adjusting the stop 6, the wheel is positioned in the guide recesses of the supports 5, resting against the mounting surface of the stop 6. Then, the clamping lever 7 with the plate 8 rotates to the closed position, finally and firmly pressing the wheel against the stop. Thus, the system of adjusting screws 9 and the force clamp of the lever 7 guarantees the absence of play, slippage, or displacement of the wheel during movement, creating a permanent and secure connection between the ski and the stroller.

[0045] Clamping lever 7 with plate 8 is the actuator of fastening mechanism 2, directly enabling quick wheel locking. It is attached to supports 5 via a hinge joint, providing the necessary mobility for operation. This design allows the user to easily and intuitively control the ski mounting and dismounting process with one hand, without the need for additional tools. Plate 8, rigidly connected to clamping lever 7, acts as a clamping platform that evenly distributes the clamping force across the side surface of the wheel, preventing localized deformation and ensuring reliable contact.

[0046] The hinge assembly of the clamping lever 7 is designed with an increased rotation angle of up to 100 degrees. This opening angle serves two important purposes. Firstly, it provides maximum free and convenient access to the wheel mounting area, allowing the wheel to be easily inserted into the guides of the supports 5, even with large or wide tires. Secondly, this lever movement ensures an ergonomic and safe hand position when opening and closing, minimizing effort and eliminating the risk of pinched fingers, which is especially critical when using the device in cold weather, when hands may be occupied by gloves and fine motor skills are impaired.

[0047] The mechanism is locked into place when the clamping lever 7 with the plate 8 is moved to the closed position until a distinctive click is heard. This audible and tactile signal confirms the complete and proper operation of the integrated locking system (the latch). In this position, the mechanism enters a state of force, rather than simply positional locking: the internal latch elements or the spring assembly create a rigid locking force, actively preventing spontaneous opening. This reliably protects the wheel from any unwanted movement—both lateral (sideways) and longitudinal (forward and backward)—even when negotiating snowdrifts, bumps, and other uneven snow conditions, ensuring stable movement.

[0048] Plate 8 of clamping lever 7 and stop 6 are mounted vertically and feature recesses 10. This design feature ensures complete and tight contact of the working surfaces with the sidewalls of the wheel, following its contour. Recesses 10, molded to the wheel's shape, significantly increase the contact area and create a mechanical grip, which, combined with the vertical orientation, ensures uniform distribution of clamping force across the entire contact area. The result is a rigid and balanced clamping system that effectively resists lateral loads and vibrations, completely eliminating lateral movement or wheel rotation within the clamping mechanism, even when driving on uneven snow.

[0049] Supports 5 with guide recesses are rigidly and permanently connected to support part 1 via a detachable connection, such as a screw or bolt. This solution ensures a completely rigid and unchangeable connection between the ski's supporting platform and the wheel locking unit, forming a single structural system. This installation completely eliminates any relative displacement, vibration, or play between these key components during operation, which is essential for the precise and predictable transfer of control forces from the stroller to the sliding surface. Furthermore, the detachable nature of the connection offers practical advantages: it allows for assembly in the factory, as well as potential repair or maintenance of the device throughout its life cycle, without compromising its strength and reliability in the field.

[0050] Along the outer and inner supports 5 are adjustment scales 11, designed to precisely adjust the position of the stop 6 relative to the plate 8 of the clamping lever 7. These scales feature marked divisions that allow for visual inspection and reproducible setting of the required clearance in the clamping mechanism. This solution allows the user to quickly and accurately adapt the ski to the specific diameter and profile of their stroller wheel, ensuring perfect centering and secure fixation without any play. This makes the device universal and ready for effective use with a wide range of strollers, strollers, and wheelchair models.

[0051] The stop 6 is provided with hooks 12, which are designed to securely grip the wheel surface, preventing it from slipping or shifting while moving on snow (Fig. 3). These hooks 12 are protruding teeth or spikes integrated into the structure of the stop 6, which enhances frictional adhesion to the rubber or plastic of the stroller wheel, especially on slippery or uneven surfaces.The plate 8 of the clamping lever 7 is knurled – a textured surface in the form of notches or ribs, which provides additional friction and prevents the user's fingers from slipping when manipulating the lever. This design allows for even distribution of pressure on the wheel, minimizing the risk of deformation or damage, and facilitates quick and secure fixation without the use of tools. This technical solution increases the overall reliability of the mechanism, making it resistant to vibrations and external influences, which is especially important in winter conditions, where snow and ice can create additional challenges for the stability of the fastening.

[0052] The stroller ski features quick installation and removal, taking just a few seconds. To install, simply place the wheel in the mounting mechanism 2 between the clamping lever 7 with the plate 8 and the stop 6, then lower the clamping lever 7 until it locks into place. Unlike traditional sled runners, this doesn't require removing the wheels or using complex tools. Furthermore, the skis don't affect the stroller's brakes, as they only attach to the front wheels without brakes.

[0053] Another key feature is versatility: the skis are suitable for all wheel types (spoke or solid) and can be used on swivel strollers. A single ski is sufficient for three-wheel strollers, while a pair is required for four-wheel strollers. Using the skis also improves safety: the device minimizes the risk of a child falling out of the stroller due to its stability, and wheelchairs require no assistant for installation.

[0054] All components of the stroller ski are assembled at the manufacturer's factory, mounted on the support part 1 and then delivered to the consumer.

[0055] The presence of the support part 1, which contacts the snow through a sliding flat part with a curved front and tail part, ensures the floatation of the stroller on the snow cover, distributing its weight and preventing the wheels from sinking into loose or deep snow, and the fastening mechanism 2, rigidly and detachably mounted on the support part 1, guarantees reliable fixation of the wheel without lateral or longitudinal displacement, creating a single stable system for movement on the snow, and as a result, the cross-country ability of the stroller on the snow cover increases.

[0056] The support part 1 is made with a curved tail and front part, thereby the curved front part of the support part 1 facilitates the entry of the ski into the snow, reducing resistance at the beginning of the movement, and the curved tail part of the support part 1 ensures a smooth exit from the snow cover, preventing skidding and abrupt stops, which together contributes to an even and stable glide on the snow surface without getting stuck, and, as a result, the cross-country ability of the stroller on the snow cover increases.

[0057] The fastening mechanism 2 is mounted on the outer surface of the support part 1, thereby providing a reliable and stable connection between the elements, preventing displacement and vibration of the fastening mechanism while moving on snow, which guarantees a stable position of the wheel and an even distribution of the load on the support part 1 for effective sliding, and as a result, the cross-country ability of the stroller on snow cover increases.

[0058] Grooves 3 are made along the entire supporting part 1, which ensures the stability and straightness of the ski's movement on the snow, preventing its lateral sliding and yaw, and also contributes to the effective removal of snow mass, which reduces the overall resistance to movement and improves the controllability of the stroller, and as a result, the cross-country ability of the stroller on the snow cover increases.

[0059] Guide grooves 4 are made along the edges of the support part 1, which creates lateral stops that effectively prevent lateral sliding and slipping of the ski from the intended trajectory of movement, especially on loose or uneven snow cover, ensuring stability and precise directional movement of the stroller without loss of control, and, as a result, the cross-country ability of the stroller on the snow cover increases.

[0060] Guide grooves 4 are made deeper than grooves 3 made in the central part of the supporting part 1, thereby creating more pronounced lateral limiters that interact more effectively with dense layers of snow, providing increased resistance to lateral drift and improving the directional stability of the ski when moving on loose or icy snow cover, which allows you to maintain straight-line movement without skidding and loss of control, and as a result, the cross-country ability of the stroller on the snow cover increases.

[0061] The fastening mechanism 2 contains supports 5 with guide recesses, a stop 6 and a clamping lever 7 with a plate 8, which ensures a comprehensive and reliable retention of the wheel, in which the supports 5 provide basic stability and the correct orientation of the unit, the adjustable stop 6 centers the wheel and takes the main loads, and the clamping lever 7 with a plate 8 guarantees quick and powerful fixation, preventing any displacement of the wheel during operation, which together ensures constant and reliable contact of the ski with the wheel for effective overcoming of snow cover, and as a result, the cross-country ability of the stroller on snow cover increases.

[0062] Stop 6 is mounted on supports 5 with the ability to be adjusted, thereby allowing you to precisely adapt the fastening mechanism to different wheel diameters and profiles, ensuring a tight fit and even distribution of pressure on the wheel, which eliminates slippage or play while moving on snow and guarantees a stable transfer of force from the stroller to the ski for confidently overcoming snow obstacles, and, as a result, increases the cross-country ability of the stroller on snow cover.

[0063] Stop 6 is mounted on supports 5 opposite the clamping lever 7 with plate 8, which creates a balanced locking system that evenly distributes the clamping force over the contact surfaces of the wheel, ensuring its reliable retention without distortions and point loads, which prevents spontaneous displacement or rotation of the wheel in the mechanism when overcoming uneven snow and guarantees constant effective contact of the ski with the surface, and, as a result, increases the cross-country ability of the stroller on the snow cover.

[0064] The clamping lever 7 with the plate 8 is pivotally mounted on the supports 5, thereby ensuring quick and convenient locking of the wheel without the use of tools, which guarantees reliable fixation without play and slippage even when moving on uneven snow cover, maintaining constant and tight contact between the ski and the wheel to effectively overcome snow obstacles, and as a result, the cross-country ability of the stroller on the snow cover increases.

[0065] The plate 8 of the clamping lever 7 and the stop 6 are mounted vertically, which ensures a complete and tight fit of their working surfaces to the sides of the wheel, creating a uniform pressure distribution over the entire contact area and forming a stable system that effectively resists lateral loads and vibrations when moving on snow cover, which prevents the wheel from shifting and maintains reliable adhesion of the ski to the surface, and as a result, the cross-country ability of the stroller on snow cover increases.

[0066] The plate 8 of the clamping lever 7 and the stop 6 are made with recesses 10, thereby ensuring precise contour mating with the surface of the wheel, increasing the contact area and creating additional resistance to lateral and longitudinal displacements, which guarantees a rigid fixation of the wheel even under significant lateral loads and vibrations on uneven snow cover, maintaining an inseparable connection between the wheel and the ski for effective sliding, and as a result, the cross-country ability of the stroller on the snow cover increases.

[0067] Support part 1 is made of plastic (polyoxymethylene), which improves the stroller's cross-country ability on snow due to the unique combination of performance properties of this material: a low coefficient of friction ensures minimal sliding resistance, allowing the ski to move easily even on loose and wet snow, high rigidity and strength guarantee the preservation of the geometry and integrity of the curved front and tail sections under load, which contributes to the correct "floating" and smooth movement without digging; the outstanding wear resistance of polyoxymethylene protects the sliding surface from the abrasive effects of compacted snow and ice, maintaining low friction throughout the entire service life, frost resistance eliminates brittleness and cracking at extremely low temperatures, maintaining reliability and functionality in any winter conditions;and low adhesion to snow and ice prevents the sticking of mass, which could increase weight and resistance, and together these properties of the material directly contribute to the effective distribution of the stroller's weight, stable sliding and, as a result, confidently overcoming snow obstacles without getting stuck.

[0068] The fastening mechanism 2 is made of plastic (polyoxymethylene), which improves the stroller's maneuverability on snow thanks to the key characteristics of this polymer: its high rigidity and strength ensure absolute stability of the entire fastening structure under load, eliminating deformations and backlashes that could lead to wheel displacement and loss of control on uneven snow; the low coefficient of friction promotes the smooth movement of hinge elements, such as the clamping lever 7, guaranteeing their easy and reliable operation even in icy conditions, which is critical for quick and safe fastening; the outstanding wear resistance of polyoxymethylene protects the critical parts of the fastening mechanism 2 from the abrasive effects of snow and ice chips, maintaining the accuracy and reliability of fixation throughout the entire service life;The frost resistance of the material prevents brittleness and loss of elasticity in the cold, ensuring the constant readiness of the mechanism to work in the harshest winter conditions, and the low weight of the polymer minimizes the inertial load on the wheel and the overall weight of the device, which contributes to the ease of control of the stroller. Ultimately, these properties of the material guarantee that the fastening mechanism 2 performs its main function - it creates a rigid, unbreakable and stable connection of the wheel with the ski, which does not weaken from vibrations and loads, thereby ensuring the effective transfer of force from the stroller to the sliding surface for confidently overcoming snow obstacles.

[0069] Supports 5 with guide recesses are rigidly mounted on the supporting part 1, which increases the cross-country ability of the stroller on the snow cover by creating a single, continuous and geometrically stable system that completely eliminates mutual displacement or vibration of the elements during movement on uneven snow cover, such a rigid connection, made using a screw or bolt fastening, guarantees an accurate and constant position of the wheel relative to the sliding plane of the supporting part 1, ensuring optimal distribution of the stroller's weight and predictable transmission of control forces from the handle to the ski, the absence of backlash and vibrations in the fastening unit prevents ski yaw, its lateral drift and loss of directional stability, especially on loose or icy snow, which allows you to maintain straight-line movement and confidently overcome obstacles, in addition, rigid fixation of supports 5 on the supporting part 1 minimizes energy loss during sliding,since all the force from the wheel is transferred to the support part 1 without damping, effectively converting it into translational motion, and ultimately this design feature ensures reliable and predictable operation of the entire ski, which is a fundamental condition for maintaining high cross-country ability and controllability of the stroller in difficult snow conditions.

[0070] Stop 6 is mounted on supports 5 opposite the clamping lever 7 with plate 8 using adjusting screws 9, which increases the cross-country ability of the stroller on snow cover by providing precise and individual adjustment of the mechanism for specific dimensions and profile of the wheel, which guarantees its absolutely tight and backlash-free fixation, such an adjustable and balanced system creates a uniform distribution of the clamping force over the entire contact surface of the wheel, preventing its local deformation, slippage or spontaneous displacement when overcoming snow irregularities and vibrations, the position of the stop 6, rigidly fixed with the help of adjusting screws 9 after adjustment, ensures the reliability of the created clamping throughout the entire operation, eliminating loosening of the fastening, which could lead to loss of control over the ski, in addition, this design allows you to quickly adapt the device to different types of strollers without the use of additional tools,Providing versatility while maintaining maximum rigidity and stability throughout the entire mounting assembly, this ultimately creates a seamless and predictable connection between the wheel and the sliding surface, directly contributing to efficient and safe movement on challenging snow conditions.

[0071] The clamping lever 7 with the plate 8 is designed to rotate at an angle of up to 100 degrees, which increases the stroller's cross-country ability on snow cover by providing wide and unimpeded access to the clamping area, which allows you to quickly, accurately and without physical effort install or remove the wheel even in conditions of limited visibility or when using thick winter gloves, minimizing the time of preparation for movement, such an angle of rotation guarantees a complete and safe withdrawal of the lever, eliminating accidental slipping of the wheel or incomplete closing of the mechanism, which leads to the formation of a reliable, forceful closure with a characteristic click, which absolutely eliminates spontaneous unfastening and any displacement of the wheel when overcoming snowdrifts, hummocks and other snow irregularities;the reliability of fixation ensured by this design feature directly contributes to maintaining a rigid kinematic connection between the wheel and the ski, which is a prerequisite for the effective transmission of traction and control force, as well as for maintaining directional stability and predictability of the behavior of the entire system on slippery or loose snow cover.

[0072] The stop 6 is provided with hooks 12, and the plate 8 of the clamping lever 7 is knurled, which increases the stroller's maneuverability on snow cover by creating the most reliable adhesion between the fastening mechanism and the wheel: hooks 12 in the form of protruding teeth aggressively grip the tire surface, completely eliminating its slippage and lateral displacement even under significant lateral loads that occur when moving on loose or uneven snow, which guarantees a stable and direct transfer of force from the stroller to the ski, at the same time, the corrugated textured surface of the plate 8 provides reliable contact with the user's fingers, preventing the hand from slipping when operating the lever in frosty, wet conditions or when using gloves, which contributes to the quick and confident closing of the mechanism with the required clamping force;Together, these elements form a balanced power-locking system that evenly distributes pressure on the wheel, preventing its deformation and ensuring an unbreakable kinematic connection. This, in turn, makes the movement of the stroller predictable, stable and efficient, allowing it to confidently overcome snow obstacles without losses due to slippage or play in the fastening unit.

[0073] Along the supports 5 on the outer and inner sides there are adjustment scales 11 for adjusting the stop 6 relative to the plate 8 of the clamping lever 7, which increases the cross-country ability of the stroller on snow cover by providing precise, visually controlled and reproducible adjustment of the fastening mechanism 2 for a specific diameter and profile of the wheel, which guarantees its centering and backlash-free fixation, such precise calibration creates a uniform and optimal distribution of the clamping force over the entire contact surface of the wheel, completely eliminating local distortions, point loads and the possibility of slippage even under extreme lateral and impact loads that occur on loose, bumpy or icy snow, the ability to quickly and accurately adapt to any wheel in a wide range of sizes makes the device universal and always ready for effective operation, providing a consistently reliable and rigid connection,which converts the pushing force from the carriage into a clear and predictable forward movement of the ski without energy loss due to vibration or wheel displacement in the clamp, which is a fundamental condition for maintaining high directional stability, controllability and overall efficiency of movement on difficult snow cover.

[0074] The technical result is achieved due to the fact that the ski for the stroller includes a support part 1 and a fastening mechanism 2, wherein the support part 1 is made of plastic with a bent tail and front part, the fastening mechanism 2 is made of plastic and mounted with a detachable connection on the outer surface of the support part 1, grooves 3 are made along the entire support part 1, while guide grooves 4 are made along the edges of the support part 1, made with a depth greater than the grooves 3 made in the central part, the fastening mechanism 2 contains supports 5 with guide recesses, a stop 6 and a clamping lever 7 with a plate 8, while hooks 12 are made on the stop 6, and knurling is made on the plate 8 of the clamping lever 7, supports 5 with guide recesses are rigidly mounted on the support part 1, along the supports 5 on the outer and inner sides there are adjustment scales 9 for adjusting the stop 6 relative to the plate 8 of the clamping lever 7,wherein the stop 6 is mounted on the supports 5 opposite the clamping lever 7 with the plate 8 using the adjusting screws 9 and is made with the possibility of adjustment using the adjusting screws 9, and the clamping lever 7 with the plate 8 is fixed pivotally on the supports 5 and is made with the possibility of rotating at an angle of up to 100 degrees, in addition, the plate 8 of the clamping lever 7 and the stop 6 are mounted vertically oriented and are made with recesses 10, which increases the cross-country ability of the stroller on the snow cover due to the complex synergistic interaction of all the specified design elements: the use of polyoxymethylene for the supporting part 1 and the fastening mechanism 2 ensures minimal sliding friction, high rigidity, wear and frost resistance, the curved front and tail parts facilitate entry into the snow and prevent digging, the system of grooves 3 and reinforced guide grooves 4 guarantees directional stability, snow removal and resistance to lateral drift,The supports 5, rigidly mounted on the supporting part, create a single stable platform, and the stop 6, adjustable with the help of adjusting screws 9 and adjusting scales 11, in combination with the articulated clamping lever 7, equipped with hooks 12, knurling and recesses 10, ensures fast, absolutely reliable and individually adjustable fixation of the wheel without the slightest play, which together forms a continuous, vibration-resistant and optimized for sliding system that effectively distributes weight, transmits control forces and allows the wheels of the stroller to “float” above the snow cover, confidently overcoming loose and uneven areas with minimal resistance and maximum safety.

[0075] The stroller ski is used as follows.

[0076] Stroller skis are used to facilitate movement on snowy surfaces, attaching them to the front wheels of the stroller without removing the wheels or using tools. First, adjust stop 6 on supports 5 using adjusting screws 9, using adjustment scales 11 as a guide, to adapt fastening mechanism 2 to the diameter and profile of the specific wheel. Then, place the stroller wheel in the guide recesses of supports 5, ensuring its centering between stop 6 and plate 8 of clamping lever 7.

[0077] Next, rotate clamping lever 7 to an angle of up to 100 degrees to open the mechanism, then lift it upward until it locks into place with a distinctive click. Plate 8 is pressed firmly against the wheel thanks to recesses 10 and knurling, while stop 6 with hooks 12 securely grips the opposite side of the wheel. This secures the ski to the stroller wheel, where support part 1 with its curved front and rear sections contacts the snow through a sliding flat surface, while grooves 3 and guide grooves 4 ensure stability and prevent lateral slippage.

[0078] When moving, the skis distribute the stroller's weight. The curved front of the support section 1 facilitates entry into the snow, while the tail section prevents digging in. Grooves 3 channel snow mass, maintaining a straight line, while deeper guide grooves 4 provide lateral support for directional stability. The mounting mechanism 2 maintains a secure fit, allowing the stroller to traverse loose or packed snow without the wheels sinking.

[0079] After use, remove the skis by turning the clamping lever 7 downward to open the mechanism, releasing the wheel from the recesses 10 and hooks 12. Store the skis in a dry place, periodically checking the adjustment screws 9 and the hinge mechanism to ensure durability. This allows the skis to be used in everyday winter conditions, increasing the safety and comfort of movement for both parents and children.

[0080] Examples of implementation of skis for a stroller.

[0081] …

[0082] The first example of the implementation of a ski for a stroller is a design intended for standard baby strollers with swivel wheels with a diameter of 200 mm and a width of 40 mm, where the supporting part 1 is made of polyoxymethylene as a thermoplastic plastic with a bent tail and front part having a bending radius of 50 mm for optimal entry into the snow and preventing digging, the length of the supporting part 1 is 385 mm, the width is 120 mm, and the assembled height is 70 mm, the fastening mechanism 2 is made of the same polyoxymethylene and is mounted with a detachable connection in the form of four M6 bolts on the outer surface of the supporting part 1 to ensure a rigid connection without backlash; along the entire supporting part 1, grooves 3 are made in the amount of six, with a rectangular cross-section 2.5 mm deep and 5 mm wide, located in parallel to remove snow and reduce friction;along the edges of the supporting part 1 there are guide grooves 4 in a trapezoidal cross-section with a depth of 10 mm and a width at the base of 8 mm, made with a depth greater than the grooves 3 in the central part, for creating lateral stops and preventing drift; the fastening mechanism 2 contains supports 5 with guide recesses in the form of a semicircle with a radius of 100 mm for centering the wheel, a stop 6 and a clamping lever 7 with a plate 8; on the stop 6 there are hooks 12 in the form of four teeth with a height of 3 mm for gripping the tire, on the plate 8 of the clamping lever 7 there is knurling in the form of cross notches with a depth of 1 mm to prevent slipping of the stroller wheel, the supports 5 with guide recesses are rigidly mounted on the supporting part 1 using the same bolts for complete integration;along the supports 5 on the outer and inner sides there are adjustment scales 11 with divisions of 5 mm for adjusting the stop 6 relative to the plate 8 of the clamping lever 7, the stop 6 is mounted on the supports 5 opposite the clamping lever 7 with the plate 8 by means of two adjustment screws 9 with a diameter of 5 mm and is configured to be adjusted by means of these adjustment screws 9 at a distance of up to 50 mm, the clamping lever 7 with the plate 8 is pivotally fixed on the supports 5 and is configured to rotate at an angle of up to 100 degrees for easy access, in addition, the plate 8 of the clamping lever 7 and the stop 6 are mounted vertically oriented at an angle of 90 degrees to the supporting part 1 and are made with recesses 10 in the form of an arc with a radius of 100 mm for a tight grip on the wheel, the total mass of the ski does not exceed 0.6 kg, and the coefficient of sliding friction on snow is 0.1 for easy movement.

[0083] The second example of the implementation of a ski for a stroller is a version for wheelchairs with cast wheels with a diameter of 250 mm and a width of 50 mm, where the supporting part 1 is made of polyoxymethylene as a frost-resistant plastic with a curved tail and front part having a bending radius of 60 mm to improve buoyancy in deep snow, the length of the supporting part 1 is 390 mm, the width is 130 mm, and the assembled height is 75 mm; the fastening mechanism 2 is made of highly wear-resistant polyoxymethylene and is mounted with a detachable connection in the form of six M5 screws on the outer surface of the support part 1 for reliable fixation without vibrations, along the entire support part 1 there are grooves 3 in the amount of eight, with a rectangular cross-section 2 mm deep and 4 mm wide, oriented longitudinally to minimize snow adhesion, along the edges of the support part 1 there are guide grooves 4 in a trapezoidal cross-section 11 mm deep and 9 mm wide at the base, made with a depth greater than the grooves 3 in the central part,to enhance directional stability on icy surfaces, fastening mechanism 2 comprises supports 5 with guide recesses in the shape of an ellipse with a major axis of 125 mm for adaptation to wide wheels, a stop 6 and a clamping lever 7 with a plate 8, on stop 6 there are hooks 12 in the form of six spikes 4 mm high for aggressive grip of a hard tire, on plate 8 of clamping lever 7 there is knurling in the form of parallel ribs 1.5 mm deep, supports 5 with guide recesses are rigidly mounted on support part 1 using screws to create a monolithic structure, along supports 5 on the outer and inner sides there are adjustment scales 11 with divisions of 4 mm for fine adjustment of stop 6 relative to plate 8 of clamping lever 7, stop 6 is mounted on supports 5 opposite clamping lever 7 with plate 8 using three adjusting screws 9 with a diameter 6 mm and is adjustable by means of these adjusting screws 9 to a distance of up to 60 mm,The clamping lever 7 with the plate 8 is pivotally secured to the supports 5 using a reinforced axis with a diameter of 10 mm and is configured to rotate at an angle of up to 100 degrees for ergonomic installation, in addition, the plate 8 of the clamping lever 7 and the stop 6 are mounted vertically oriented at an angle of 90 degrees to the support part 1 and are made with recesses 10 in the form of a semicircle with a radius of 125 mm for uniform pressure distribution, the total mass of the ski is 0.65 kg, and the coefficient of sliding friction on snow is in the range of 0.08-0.12 for energy-saving sliding.

[0084] The third example of the implementation of the ski for the stroller is a model for lightweight strollers with spoked wheels with a diameter of 180 mm and a width of 30 mm, where the supporting part 1 is made of polyoxymethylene as a moisture-resistant plastic with a bent tail and front part, having a bending radius of 45 mm for maneuverability on compacted snow, the length of the supporting part 1 is 375 mm, the width is 110 mm, and the assembled height is 65 mm, the fastening mechanism 2 is made of polyoxymethylene with a low specific gravity and is mounted with a detachable connection in the form of five M4 bolts on the outer surface of the supporting part 1 for easy maintenance;Along the entire supporting part 1 there are grooves 3 made in the amount of five, with a rectangular cross-section, 3 mm deep and 6 mm wide, intended to form a water film and reduce resistance, along the edges of the supporting part 1 there are guide grooves 4 in a trapezoidal cross-section, 9 mm deep and 7 mm wide at the base, made deeper than the grooves 3 in the central part, to prevent lateral sliding on wet snow, the fastening mechanism 2 contains supports 5 with guide recesses in the form of an arc with a radius of 90 mm for quick installation, a stop 6 and a clamping lever 7 with a plate 8; on the stop 6 there are hooks 12 in the form of three teeth 2.5 mm high for a soft but secure grip of the spoked wheel, on the plate 8 of the clamping lever 7 there is knurling in the form of point notches 0.8 mm deep for convenience in cold conditions;supports 5 with guide recesses are rigidly mounted on the support part 1 using bolts to prevent displacement, along the supports 5 on the outer and inner sides there are adjustment scales 11 with divisions of 3 mm for the precise adjustment of the stop 6 relative to the plate 8 of the clamping lever 7; the stop 6 is mounted on the supports 5 opposite the clamping lever 7 with the plate 8 using two adjustment screws 9 with a diameter of 4 mm and is made with the possibility of adjustment using these adjustment screws 9 at a distance of up to 40 mm;the clamping lever 7 with the plate 8 is pivotally fixed on the supports 5 using an axis with a diameter of 7 mm and is made with the ability to rotate at an angle of up to 100 degrees for intuitive use, in addition, the plate 8 of the clamping lever 7 and the stop 6 are mounted vertically oriented at an angle of 90 degrees to the supporting part 1 and are made with recesses 10 in the form of an ellipse with a major axis of 90 mm to minimize the deformation of the wheel, the total mass of the ski is no more than 0.55 kg, and the coefficient of sliding friction on snow is about 0.07 for maximum smoothness.

[0085] The fourth example of the implementation of the ski for the stroller is a configuration for three-wheeled baby strollers with a swivel front wheel with a diameter of 220 mm and a width of 45 mm, where the supporting part 1 is made of polyoxymethylene as a thermoplastic plastic with a curved tail and front part having a bending radius of 55 mm to improve maneuverability when turning in the snow, the length of the supporting part 1 is 380 mm, the width is 125 mm, and the assembled height is 72 mm; the fastening mechanism 2 is made of polyoxymethylene with high frost resistance and is mounted with a detachable connection in the form of five M5 bolts on the outer surface of the supporting part 1 to ensure strong integration without deformation; Along the entire support part 1, grooves 3 are made in the amount of seven, with a rectangular cross-section, a depth of 2.2 mm and a width of 5.5 mm, placed symmetrically for the effective drainage of melt water and a reduction in the friction coefficient to 0.09, along the edges of the support part 1, guide grooves 4 are made in a trapezoidal cross-section, a depth of 10,5 mm and 8.5 mm wide at the base, made deeper than the grooves 3 in the central part, to enhance lateral grip on compacted snow; the fastening mechanism 2 contains supports 5 with guide recesses in the form of a semicircle with a radius of 110 mm for precise positioning of the wheel, a stop 6 and a clamping lever 7 with a plate 8; on the stop 6, hooks 12 are made in the form of five teeth 3.5 mm high for a secure grip of the tire tread; on the plate 8 of the clamping lever 7, there is a knurling in the form of diagonal notches with a depth of 1.2 mm to prevent slipping in conditions of high humidity, the supports 5 with guide recesses are rigidly mounted on the support part 1 using bolts to create a single rigid structure, along the supports 5 on the outer and inner sides there are adjustment scales 11 with divisions of 4.5 mm for precise adjustment of the stop 6 relative to the plate 8 of the clamping lever 7,The stop 6 is mounted on the supports 5 opposite the clamping lever 7 with the plate 8 by means of two adjusting screws 9 with a diameter of 5.5 mm and is configured to be adjusted by means of these adjusting screws 9 at a distance of up to 55 mm, the clamping lever 7 with the plate 8 is pivotally fixed on the supports 5 by means of an axis with a diameter of 9 mm and is configured to rotate at an angle of up to 100 degrees for ease of installation with one hand, in addition, the plate 8 of the clamping lever 7 and the stop 6 are mounted vertically oriented at an angle of 90 degrees to the supporting part 1 and are made with recesses 10 in the form of an arc with a radius of 110 mm for uniform grip and load distribution, the total weight of the ski does not exceed 0.62 kg, and the coefficient of sliding friction on snow is in the range of 0.06-0.11 for optimal energy saving during movement.

[0086] The fifth example of the implementation of a ski for a stroller is a variant for compact strollers with narrow cast wheels with a diameter of 160 mm and a width of 25 mm, where the support part 1 is made of polyoxymethylene as a wear-resistant plastic with a curved tail and front part, having a bending radius of 40 mm for increased compactness and ease of storage, the length of the support part 1 is 370 mm, the width is 105 mm, and the assembled height is 62 mm; the fastening mechanism 2 is made of polyoxymethylene with low adhesion to snow and is mounted with a detachable connection in the form of four M4 screws on the outer surface of the support part 1 for quick dismantling if necessary; along the entire support part 1, grooves 3 are made in the amount of four, with a rectangular cross-section 2.8 mm deep and 4.5 mm wide, oriented to minimize snow sticking and create an air gap;Along the edges of the supporting part 1 there are guide grooves 4 in a trapezoidal cross-section with a depth of 9.5 mm and a width at the base of 7.5 mm, made with a depth greater than the grooves 3 in the central part, to prevent slipping on wet or loose snow; the fastening mechanism 2 contains supports 5 with guide recesses in the form of an ellipse with a major axis of 80 mm for adaptation to narrow wheels, a stop 6 and a clamping lever 7 with a plate 8, on the stop 6 there are hooks 12 in the form of two spikes 2 mm high for a delicate but strong grip of a smooth surface; on the plate 8 of the clamping lever 7 there is knurling in the form of horizontal ribs 0.9 mm deep for an ergonomic grip in gloves, the supports 5 with guide recesses are rigidly mounted on the supporting part 1 using screws to eliminate vibrations; along the supports 5 on the outer and inner sides there are adjustment scales 11 with divisions of 2.5 mm for precise calibration of the stop 6 relative to the plate 8 of the clamping lever 7;the stop 6 is mounted on the supports 5 opposite the clamping lever 7 with the plate 8 by means of one adjusting screw 9 with a diameter of 4.5 mm and is configured to be adjusted by means of this adjusting screw 9 at a distance of up to 35 mm; the clamping lever 7 with the plate 8 is pivotally fixed on the supports 5 by means of an axis with a diameter of 6 mm and is configured to rotate at an angle of up to 100 degrees for intuitive and safe installation; in addition, the plate 8 of the clamping lever 7 and the stop 6 are mounted vertically oriented at an angle of 90 degrees to the supporting part 1 and are made with recesses 10 in the form of a semicircle with a radius of 80 mm to minimize the pressure on thin wheels, the total mass of the ski is 0.5 kg, and the coefficient of sliding friction on snow is about 0.05 for maximum smoothness and reduced effort.

[0087] Based on the technical results, a comparative analysis of the claimed invention was conducted with similar devices and the prototype. The analysis included testing the average speed on snow (km / h), maximum snow depth (cm), push force (N), and stability (number of lateral drifts per 100 m).

[0088] For an objective comparison, all devices were examined under the same conditions:

[0089] - Stroller type: standard four-wheel baby stroller with front swivel wheels with a total weight of 15 kg (including imitation baby).

[0090] - Snow cover: loose snow with a density of 0.2 g / cm³, temperature -5 ° C, humidity 70%.

[0091] - Test section: a straight path 100 m long with a 5° slope and artificial unevenness (snowdrifts up to 10 cm high).

[0092] - Installation: The skis were mounted on the front wheels without tools, the test was carried out with a constant pushing speed by the operator (weight 70 kg).

[0093] - Tests: measuring speed with a GPS tracker, snow depth with a laser rangefinder, pushing force with a dynamometer, stability by visually counting drifts (lateral deviation>10°).

[0094] US9950732B1 has an average speed of 3.2 km / h on snow, a maximum snow depth of 15 cm, a pushing force of 45 N, and stability of 5 lateral drifts per 100 m.

[0095] US2024109578A1 had an average speed of 3.5 km / h on snow, a maximum snow depth of 18 cm, a push force of 40 N, and stability of 4 lateral drifts per 100 m.

[0096] The EP2366370A1 had an average speed of 3.8 km / h on snow, a maximum snow depth of 20 cm, a pushing force of 35 N, and stability of 3 lateral drifts per 100 m.

[0097] At the same time, the claimed invention had an average speed of movement on snow cover of 4.5 km / h, a maximum snow depth of 25 cm, a pushing force of the stroller of 25 N, and stability showed 1 lateral drift per 100 m of travel.

[0098] Thus, the claimed invention increases the stroller's cross-country ability on snow cover in comparison with analogs and the prototype by 15-30%, providing higher speed, greater depth of overcoming snow, less pushing force and increased stability due to the optimized design with grooves 3 and guide grooves 4, adjustable fastening mechanism 2 and the use of polyoxymethylene.

Images