The disclosure is generally directed to wheel suspension assemblies for cycles, and is more specifically directed to wheel suspension assemblies for cycles that include a travel indicator.
Suspensions are key components of wheeled vehicles, including cycles. Suspensions allow a wheel to move in a compliant manner in response to ground conditions as a rider pilots a cycle, while improving handling and control during riding. In many cases, suspensions comprise links and pivot assemblies which together form an articulating mechanism which allows a wheel to move. Pivot assemblies allow suspension components such as links to articulate in one or more degrees of freedom, typically via rotation.
Recently, telescopic front suspension forks have dominated suspension systems for two-wheeled vehicles. A telescopic fork includes sliding stanchions connected in a steerable manner to a cycle frame, and at the same time, includes a telescoping mechanism for wheel displacement. Few, if any telescopic forks include pivot assemblies.
Linkage front suspensions, comprising links and pivot assemblies, have been attempted in the past as an alternative to telescopic forks, yet they have failed to achieve market dominance. In contrast, linkages comprising links and pivot assemblies account for almost all the rear suspensions available for two wheeled suspension structures sold today, and almost no examples of solely telescopic or sliding rear suspension structures can be found in today's marketplace.
While linkages including links and pivot assemblies can be economically manufactured, and typically feature very low friction, and linkages are also relatively easy to seal from the elements, linkages suffer from poor kinematic performance, usually driven by prioritizing brake dive performance rather than stability.
Telescopic forks on the other hand use sliding stanchions, which require very expensive and tight manufacturing tolerances. Outer surfaces of the stanchion typically slide against bushings to allow for compliance. Front suspension for a cycle is subject to large bending forces fore and aft and less significant lateral forces. Because telescopic forks have relatively large stanchions, and relatively large siding surfaces and seals, large breakaway friction in the system (known as stiction) is generated by these components. Stiction resists compression of the suspension in reaction to bumps, which is a drawback in a suspension product where the goal is to react to road or terrain conditions, for example by deflecting in response to ground conditions, and/or absorbing impact from bumps. Additionally, as the telescopic fork is loaded in the fore/aft direction (usually on impact or braking), the bushings bind, resulting in even greater stiction at the exact moment when a rider needs the most compliance. Telescopic forks and their large sliding bushings also require smooth stanchion surfaces and significant maintenance and upkeep to keep performance from diminishing quickly.
The quality of cycle suspension performance is tied to proper setup for the rider. One of the most important measurements that can help a rider to achieve proper setup is the amount of suspension travel actuated during different riding conditions. Suspension travel is a measurement of suspension deflection during suspension compression. This measurement can help the rider to understand how much suspension displacement is being used in both static and dynamic tests, and with this knowledge, alterations such as spring force or damper settings can be made in an educated manner. Making these alterations can allow the rider to improve suspension performance according to the rider's preferences.
Measuring suspension travel on a telescopic fork or rear shock typically requires two people, one to compress the suspension and the other to measure the suspension displacement with a ruler. This is a difficult, time consuming, and frequently inaccurate method of measuring suspension displacement. External devices such as tape measures adapted for one person suspension displacement measuring have been tried with limited success. Another method involves affixing an o-ring around the stanchion or sliding shaft, and letting the o-ring contact the fork or shock seal. As the suspension compresses, the o-ring is forced along the stanchion or shaft via contact with the seal, and then when the suspension is fully extended, a measurement between measurement between the o-ring and seal can be made to determine suspension travel used. Using an o-ring to measure travel is problematic because it can trap dirt and grit against the stanchion or shaft, causing surface damage and further compromising friction, stiction, and suspension performance. Furthermore, o-rings are fragile thin section pieces of rubber that can be easily damaged or degrade over time, and in some cases are impossible or difficult to replace when damaged due to fork or shock construction.
In accordance with one aspect, a suspension assembly for a cycle includes a link having a pivot assembly. An indicator having a central opening is operably connected to the pivot assembly. A scale is located on the link. The indicator includes a pointer that is offset from the center of the indicator.
In accordance with another aspect, a suspension assembly for a cycle includes a link and an indicator having a central opening. The indicator includes a first retention feature. A pivot assembly is disposed in the link. The pivot assembly includes a second retention feature. The first retention feature and the second retention feature cooperate to axially retain the indicator on the pivot assembly while allowing rotational movement between the indicator and the pivot assembly when a force threshold is exceeded.
The present invention is not limited to the specific embodiments described below, which are intended as exemplary illustrations of individual aspects of the invention. Functionally equivalent methods and components fall within the scope of the invention. Indeed, various modifications of the invention, in addition to those shown and described herein, will become apparent to those skilled in the art from the foregoing description. Such modifications are intended to fall within the scope of the appended claims. Throughout this application, the singular includes the plural and the plural includes the singular, unless indicated otherwise. The words “formed,” “provided,” “disposed,” and “located” are used interchangeably to denote relative positioning in the instant description. All cited publications, patents, and patent applications are herein incorporated by reference in their entirety.
The disclosed travel indicator combined with multi-link cycle suspension assemblies, such as the suspension assemblies described in U.S. patent application Ser. No. 15/661,821, filed on Jul. 27, 2017; and the disclosed travel indicator may be used in conjunction with pivot assemblies such as the pivot assemblies described in U.S. patent application Ser. No. 16/153,396, filed on Oct. 5, 2018. Each of U.S. patent application Ser. Nos. 15/661,821 and 16/153,396 are hereby incorporated by reference herein.
In suspensions with pivots, attempts to measure travel via a rotating dial have been made in the past. These rotating dials suffer from a host of issues that make them difficult and inaccurate to read. For example, most rotating dials have small indicators that are difficult to read and/or read only instantaneous compression of the suspension.
Turning now to
A travel indicator 16 and scale 18 are included on one pivot assembly 20 to measure travel displacement (e.g., compression) of the front wheel suspension assembly 12, thereby providing the rider a measurement that may be used as a basis for making changes to suspension settings (e.g., changes to spring forces in a shock absorber or spring unit and/or to frictional forces in the pivot assembly) in a purposeful manner, thereby changing performance of the front wheel suspension assembly 12 and better customizing a rider's experience according to the manufacturer recommendations and/or a rider's preferences.
Turning now to
The scale 18 is located on an external component, such as on the housing 14. The housing 14 may be part of a link 22, or in other embodiments, the housing may be part of a frame member, such as the fork arm 24. A bearing 10 is installed in the central aperture 33. The bearing 10 facilitates rotational movement between the pivot assembly 20 and the housing 14. The pivot assembly 20 positions the bearing 10 in radial and axial directions relative to the housing 14 such that any combination of links 22 or frame members 24 can articulate in a pivotable or rotatable manner. The first interference member 34 on the indicator 16 interfaces with, or is partially seated within, the second interference member 40 on the bolt 2, such that the first interference member 34 and second interference member 40 allow rotation of the indicator 16 when enough force is applied to overcome rotational friction and, at the same time, produce enough rotational friction to prevent rotation of the indicator 16 relative to the bolt 2 when sufficient force is not present, thereby maintaining relative positioning between the indicator 16 and the bolt 2 unless sufficient force is applied.
For example, the rotational friction between the first interference member 34 and the second interference member 40 may be overcome to cause the indicator 16 to rotate relative to the bolt 2 when force is applied to the indicator 16 by, for example, an actuator 26 during suspension assembly compression, or to return the indicator 16 to a starting position by force applied by a tool or a finger after suspension assembly is complete. By allowing the indicator 16 to rotate relative to the bolt 2 during suspension assembly compression, and by maintaining the indicator 16 rotational position relative to the bolt 2 when suspension assembly compression is complete, the indicator 16 provides a measurement of maximum suspension assembly compression for a compression event. The measurement may then be used by the rider to adjust suspension assembly characteristics to improve suspension assembly performance. While the first interference member 34 is illustrated as one or more protrusions and the second interface member 40 is illustrated as an annular channel, in other embodiments, the protrusions and the annular channel may be reversed, or other connection structures that produce rotational friction may be used. In some preferred embodiments, the indicator 16 comprises one or more of metal, plastic, composites, and compliant materials, such as natural or synthetic rubbers and urethanes. In other embodiments, the indicator comprises one or more of rubber, aluminum, steel, copper, other metals, fiberglass, carbon fiber, fiber reinforced thermoplastics, urethanes, foam, wood, and bamboo.
Turning now to
Turning now to
The central aperture 35 of the indicator 16 has a center point 37 that is coincident with a central axis of the pivot assembly 20. The pointer 30 is generally linear in shape and when viewed on the face of the indicator 16 forms a chord, intersecting the outer circumference of the indicator at two locations without passing through the center 35. In other embodiments, the indicator may or may not intersect the outer circumference of the indicator 16. The pointer 30 is offset a distance 44 from the center point 37 of the indicator 16, when viewed face-on. This offset distance 44 is an important feature of the indicator 16, which allows the user to easily and accurately read the suspension travel. In some preferred embodiments, the offset distance 44 is between 50% and 90%, more preferably between 60% and 85%, of the radius of the indicator 16. By locating the pointer 30 away from the center point 37 by the offset distance 44, the pointer 30 can be much longer than other arrangements, and the pointer 30 is in a better location to cooperate with the scale 18. For example, the pointer 30 can be longer than a radius of the indicator 16. This longer offset distance 44 of the pointer 30 is easier to read more accurately, and clearly shows which graduation or value on the scale 18 is indicated during suspension travel. In certain preferred embodiments, the pointer 30 may be colored to allow easy visibility. In other embodiments, the pointer 30 may be textured or otherwise treated to provide a clear visual contrast with surrounding material. In yet other embodiments, the pointer 30 may have a luminescent or phosphorescent coating for better viewing in low light conditions.
Turning now to
As illustrated in
As illustrated in
Turning now to
In alternate embodiments, threads can be either internal or external on the pivot body 4 or on the bolt 2. In other embodiments, the slot 36 can be fully formed about the diameter of the pivot body 4, or formed as a partial slot 36. In yet other embodiments, the slot 36 may be formed in the bolt 2.
As illustrated in the figures, the first and second retention features 34, 40 provide a captured mounting mechanism for the indicator 16, which locates the indicator 16 axially on the bolt 2 while allowing rotational movement between the indicator 16 and the bolt 2 when sufficient force is applied to overcome rotational friction. In certain embodiments, the first retention feature 34 may be any one or more of a tab, a slot, a bump, a hole, a protrusion, a depression, a boss, a flap, or any other type of feature that can mate or interface with a corresponding second retention feature 40. In certain embodiments, the second retention feature 40 may be any one or more of a tab, a slot, a bump, a hole, a protrusion, a depression, a boss, a flap, or any other type of feature that can mate or interface with a corresponding first retention feature 34. Interference features 34, 40 may cooperate with other surfaces or other parts such as the pivot bodies 4, the bolts 2, the links 22, or/and or the frame members 24 to allow rotation of the indicator 16 and at the same time allow for enough rotational interference friction that the indicator 16 can be rotated back to an original position by the actuator 26 or by a human finger if registration of a new travel displacement measurement is desired, and also allow for enough rotational interference friction to hold the indicator 16 in place when not being acted upon outside forces, such as the actuator 26 or the human finger, such that a prior travel displacement measurement can be observed and registered.
In certain embodiments, the actuator 26 may be any one or more of a tab, a slot, a bump, a hole, a protrusion, a depression, a boss, a flap, or any other type of feature that can mate or interface with the stop member 28. In certain embodiments, the stop member 28 may be any one or more of a tab, a slot, a bump, a hole, a protrusion, a depression, a boss, a flap, or any other type of feature that can mate or interface with the actuator 26. The first and stop members 26, 28 may cooperate with other surfaces or other parts such as the pivots bodies 4, the bolts 2, the links 22, and or the frame members 24 to cause rotation of the indicator 16 when there is contact 46 between the actuator 26 and stop member 28.
The scale 18 cooperates with the indicator 16 to indicate an amount of suspension travel displacement that occurs during suspension assembly compression. The scale 18 includes graduations cooperate with the pointer 30 of the indicator 16, allowing the user read an indication of the amount of travel that has occurred, and therefore allowing the rider to use the indicated travel to make changes to suspension settings, thereby altering suspension performance to achieve a desired result. the scale 18 of may include any one or more of printing, pad printing, decals, engraving, painting, electropainting, anodizing, etching, laser etching, chemical etching, screen printing, water transfer decal, molded in marks, bosses, indentations, or other methods of creating a visual marker on a link. The scale 18 may include the following information including, either alone or in any combination, and not limited to; graduation, value, percentage, displacement, measurement, sag, min, max, specific travel amounts in percentage and/or absolute displacement (measurement), angle, and other information intended to inform the user about suspension travel displacement or help the rider to determine setup.
The pointer 30 is located an offset distance 44 from the center 35 of the indicator 16. This offset distance 44 is an important feature of the indicator 16 that allows the user to easily and accurately read the suspension travel. By locating the pointer 30 offset 44 from the center of the indicator 16, the pointer 30 can be much longer than in other arrangements The longer pointer 30 is valuable compared to shorter pointers such as one that might be located along a radius of the indicator 16 and originating at a center 37 of the indicator and using no offset 44. Pointers originating in the center are necessarily small given the small radii of existing pivots, which are 25 mm or less and usually 15 mm or less.
Elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions and/or relative positioning of some of the elements in the figures may be exaggerated relative to other elements to help to improve understanding of various embodiments of the present invention. Also, common but well-understood elements that are useful or necessary in a commercially feasible embodiment are often not depicted in order to facilitate a less obstructed view of these various embodiments. The same reference numbers may be used to describe like or similar parts. Further, while several examples have been disclosed herein, any features from any examples may be combined with or replaced by other features from other examples. Moreover, while several examples have been disclosed herein, changes may be made to the disclosed examples within departing from the scope of the claims.
A variety of modifications, alterations, and combinations can be made with respect to the above described embodiments without departing from the scope of the invention, and that such modifications, alterations, and combinations are to be viewed as being within the scope of the inventive concept.
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