A skateboard truck (200, 300), including a hanger (102″, 102′″) carrying an axle (104), and a baseplate (108″, 108′″). The axle holds a pair of wheels, which are steered in unison by the axle. The baseplate is coupled to the hanger to permit hanger rotation about a dynamic hanger rotation axis (138″
A skateboard truck (200, 300), including a hanger (102″, 102′″) carrying an axle (104), and a baseplate (108″, 108′″). The axle holds a pair of wheels, which are steered in unison by the axle. The baseplate is coupled to the hanger to permit hanger rotation about a dynamic hanger rotation axis (138″). A static mechanism (202, 302) enforces a static pivot point at a locus (111, 109′) through which the dynamic hanger rotation axis passes during turning operation. Also, a dynamic mechanism (204, 402) causes the dynamic hanger rotation axis to pass through a plurality of dynamic hanger pivot points during that turning operation. Roll of the baseplate about a skateboard roll axis (152) is operable to cause a steering rotation of the axle, and also changes the action angle (150) of the truck.
대표청구항▼
1. An apparatus, comprising: an axle structured to span in a length axis direction between a pair of wheels such that said wheels are steered in unison by said axle, displacement of said axle being constrained by structure carried by a baseplate and effective to cause steering rotation of said axle
1. An apparatus, comprising: an axle structured to span in a length axis direction between a pair of wheels such that said wheels are steered in unison by said axle, displacement of said axle being constrained by structure carried by a baseplate and effective to cause steering rotation of said axle about a dynamic hanger rotation axis; wherein:during a turn maneuver between a maximum right turn position and a maximum left turn position:said dynamic hanger rotation axis always passes through a static pivot point at a locus that is static with respect to a deck on which said baseplate is mounted;said dynamic hanger rotation axis passes through at least two instantaneous pivot points that are not co-linear with said static pivot point; androll of said baseplate about a roll axis causes a change in action angle of said axle during at least a portion of said turn maneuver. 2. The apparatus according to claim 1, wherein: said axle is carried by a hanger; andsupport structure carried by said baseplate is arranged to cooperate with pivot structure associated with a proximal end of said hanger effective to cause displacement, relative to said baseplate, of an instantaneous pivot point as said axle moves between said maximum right turn position and said maximum left turn position. 3. The apparatus according to claim 2, wherein: said support structure comprises a pivot bushing; andsaid pivot structure comprises a first pivot element and a second pivot element structured in harmony with said pivot bushing such that:during change in a macro-turn in a first direction, said first pivot element defines a first instantaneous pivot point through which said dynamic pivot axis passes, and said second pivot element rotates around said first pivot element; andduring change in a macro-turn in a second direction, said second pivot element defines a second instantaneous pivot point through which said dynamic pivot axis passes, and said first pivot element rotates around said second pivot element. 4. The apparatus according to claim 3, wherein: said first and second pivot elements are journal mounted with respect to said hanger to permit their rotation about respective rotational axes. 5. The apparatus according to claim 4, wherein: said first and second pivot elements are structured in harmony with cooperating first and second detents in a socket carried by said pivot bushing such that said first pivot element may register with said first detent to define a location of said first instantaneous pivot point, and said second pivot element may register with said second detent to define a location of said second instantaneous pivot point. 6. The apparatus according to claim 5, further comprising: a third detent and a fourth detent, wherein:said third detent is disposed to register with said second pivot element to define a maximum-turn configuration in said first direction; andsaid fourth detent is disposed to register with said first pivot element to define a maximum-turn configuration in said second direction. 7. The apparatus according to claim 3, wherein: said pivot structure further comprises a shelf, at least a portion of said shelf being structured to cooperate with a portion of said pivot bushing effective to provide a micro-steering capability for said apparatus at an essentially zero-turn configuration of said axle. 8. The apparatus according to claim 1, wherein: said apparatus is structured and arranged to cause an increase in action angle in correspondence with an increase in steering rotation of said axle. 9. The apparatus according to claim 1, wherein: said apparatus is structured and arranged to cause a decrease in action angle in correspondence with an increase in steering rotation of said axle. 10. The apparatus according to claim 1, further comprising: a kingpin anchored to said baseplate, said static pivot point being disposed on the centerline of said kingpin;a hanger carrying said axle, said hanger being anchored to said baseplate effective to permit rotation of said hanger about said dynamic axis; anda turn-limiting mechanism effective to provide a hard turn stop at maximum left turn and maximum right turn configurations; wherein:said turn-limiting mechanism is structured to avoid making contact with said kingpin. 11. The apparatus according to claim 1, wherein: from the perspective of a surface on which said apparatus is rolled, said static pivot point is disposed between the centerline of said axle and a selected one of said instantaneous pivot points. 12. The apparatus according to claim 1, wherein: from the perspective of a surface on which said apparatus is rolled, said static pivot point is disposed on the opposite side of the centerline of said axle from a selected one of said instantaneous pivot points. 13. The apparatus according to claim 1, wherein: said baseplate is coupled to a hanger that carries said axle; andfrom the perspective of a surface on which said apparatus is rolled, said static pivot point is disposed closer to the inside end of said baseplate than a selected one of said instantaneous pivot points. 14. The apparatus according to claim 1, wherein: said baseplate is coupled to a hanger that carries said axle; andfrom the perspective of a surface on which said apparatus is rolled, said static pivot point is disposed closer to the outside end of said baseplate than a selected one of said instantaneous pivot points. 15. The apparatus according to claim 1, further comprising: a hanger carrying said axle;a pair of spaced apart hanger pivot anchors defined by structure carried by said baseplate, said pivot anchors being effective to define a hanger pivot axis extending there-between;a yoke disposed to pivot around said hanger pivot axis; anda kingpin held by said yoke to dispose the centerline of said kingpin normal to said hanger pivot axis; wherein:said hanger is structured to rotate about said centerline of said kingpin while maintaining dynamic contact with said baseplate. 16. The apparatus according to claim 15, further comprising: means to urge dynamic contact between said hanger and said baseplate in the absence of gravity-enforced contact. 17. An apparatus, comprising: a hanger carrying an axle, said axle being structured to span in a length axis direction between a pair of wheels such that said wheels are steered in unison by said axle;a baseplate coupled to said hanger effective to permit rotation of said hanger about a dynamic hanger rotation axis;a static mechanism structured to enforce a substantially static pivot point at a locus through which said dynamic hanger rotation axis passes during turning operation of said apparatus; anda dynamic mechanism structured to cause said dynamic hanger rotation axis to pass through a plurality of dynamic hanger pivot points during said turning operation; wherein:roll of said baseplate about a roll axis is operable to cause a steering rotation of said axle and a change in the action angle of said axle, such that a change in said action angle during a turn maneuver between maximum left turn and right turn configurations, measured relative to said baseplate, is only a function of roll of said baseplate. 18. The apparatus according to claim 17, wherein: said dynamic turning mechanism is structured and arranged to cause a nonlinear change in turn angle responsive to change in tilt angle of said baseplate. 19. The apparatus according to claim 17, wherein: said dynamic turning mechanism is structured and arranged to cause an increase in action angle in correspondence with an increase in steering rotation of said axle. 20. An apparatus, comprising: a hanger carrying an axle, said axle being structured to span in a length axis direction between a pair of wheels such that said wheels are steered in unison by said axle; anda baseplate coupled to said hanger effective to permit rotation of said hanger about a dynamic hanger rotation axis such that tilting said baseplate around a conveyance roll axis can cause a change in action angle of said apparatus and a change in action angle during a turn maneuver between maximum left turn and right turn configurations is only a function of tilting said baseplate; wherein:said dynamic hanger rotation axis passes through a static pivot point.
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이 특허에 인용된 특허 (2)
Christensen, Mark A.; McHugh, III, George F., Axle and suspension.
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