Dual axle skateboard and truck with outboard secondary wheels and method

Patent metadata

Field	Value
Publication number	US-9925452-B2
Application number	US-201615343325-A
Country	US
Kind code	B2
Filing date	Nov 4, 2016
Priority date	Sep 16, 2014
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

Improved skateboards and methods of obtaining or providing skateboards with improved trucks. Trucks have two axles or axes, two primary wheels, and two secondary wheels, and skateboards have eight wheels, four in front and four at the rear portion of the skateboard. The four primary wheels support most or all of the weight of the skateboard when the skateboard is on a flat surface, and the two secondary wheels support the weight of one portion of the skateboard (e.g., front or rear) when the primary wheels cross a crack (e.g., a sidewalk contraction joint). In various embodiments, the secondary wheels are located outboard of the primary wheels. Further, in a number of embodiments, the axis of rotation or axle of the primary wheels remains parallel to that of the secondary wheels, whether the skateboard is going straight or turning.

First claim

What is claimed is:

1. A truck for a skateboard, the truck comprising:
a mounting surface for attaching the truck to a body of the skateboard;
a primary axle;
two primary wheels rotatably mounted on the primary axle;
at least one secondary axle that is parallel to the primary axle; and
two secondary wheels rotatably mounted on the at least one secondary axle;
wherein:
the two primary wheels each have a primary wheel diameter;
the two secondary wheels each have a secondary wheel diameter;
an axle spacing distance between the primary axle and the at least one secondary axle is less than the primary wheel diameter; and
the axle spacing distance between the primary axle and the at least one secondary axle is less than the secondary wheel diameter.

2. The truck of claim 1 wherein the primary axle is positioned so that the two primary wheels extend further from the mounting surface of the truck than the two secondary wheels.

3. The truck of claim 1 wherein:
the two primary wheels each have a primary wheel width;
the two secondary wheels each have a secondary wheel width; and
the primary wheel width is greater than the secondary wheel width.

4. The truck of claim 1 wherein the two secondary wheels are located closer together than the two primary wheels and the two secondary wheels extend between the two primary wheels.

5. The truck of claim 1 wherein:
the primary axle is positioned so that the two primary wheels extend further from the mounting surface of the truck than the secondary wheels;
the two primary wheels each have a primary wheel width;
the two secondary wheels each have a secondary wheel width;
the primary wheel width is greater than the secondary wheel width;
the two secondary wheels are located closer together than the two primary wheels; and
the two secondary wheels extend between the two primary wheels.

6. The truck of claim 1 wherein the mounting surface is attached to a front portion of the body of the skateboard.

7. The truck of claim 6 wherein:
the primary axle is located in front the at least one secondary axle.

8. The truck of claim 1 wherein the mounting surface is attached to a rear portion of the body of the skateboard.

9. The truck of claim 8 wherein:
the at least one secondary axle is located in front of the primary front axle.

10. The truck of claim 3 , wherein:
the primary wheel width is 1.5 times greater than the secondary wheel width.

11. At least one truck for a skateboard, the at least one truck comprising:
a front truck attached to a front portion of a body of the skateboard, comprising:
a primary front axle with two primary front wheels rotatably mounted on the primary front axle;
at least one secondary front axle parallel to the primary front axle, with two secondary front wheels rotatably mounted on the at least one secondary front axle; wherein
the two primary front wheels each have a primary front wheel diameter;
the two secondary front wheels each have a secondary front wheel diameter;
an axle spacing distance between the primary front axle and the at least one secondary front axle is less than the primary front wheel diameter; and
the axle spacing distance between the primary front axle and the at least one secondary front axle is less than the secondary front wheel diameter;

a rear truck attached to a rear portion of the body of the skateboard, comprising:
a primary rear axle with two primary rear wheels rotatably mounted on the primary rear axle;
at least one secondary rear axle parallel to the primary rear axle, with two secondary rear wheels rotatably mounted on the at least one secondary rear axle; wherein
the two primary rear wheels each have a primary rear wheel diameter;
the two secondary rear wheels each have a secondary rear wheel diameter;
an axle spacing distance between the primary rear axle and the at least one secondary rear axle is less than the primary rear wheel diameter; and
the axle spacing distance between the primary rear axle and the at least one secondary rear axle is less than the secondary rear wheel diameter.

12. The at least one truck of claim 11 , wherein:
the primary front axle is positioned so that the two primary front wheels extend further from a top portion of the body of the skateboard than the two secondary front wheels, and
the primary rear axle is positioned so that the two primary rear wheels extend further from the top portion of the body of the skateboard than the two secondary rear wheels.

13. The at least one truck of claim 11 , wherein:
the primary front axle is positioned in front of the at least one secondary front axle; and
the at least one secondary rear axle is positioned in front of the primary rear axle.

14. The at least one truck of claim 11 , wherein:
the at least one secondary front axle is positioned in front of the primary front axle; and
the primary rear axle is positioned in front of the at least one secondary rear axle.

15. The at least one truck of claim 11 , wherein:
the two primary front wheels each have a primary front wheel width;
the two secondary front wheels each have a primary front wheel width;
the two primary rear wheels each have a primary rear wheel width; and
the two secondary rear wheels each have a secondary rear wheel width; wherein
the primary front wheel width is greater than the secondary front wheel width; and
the primary rear wheel width is greater than the secondary rear wheel width.

16. The at least one truck of claim 15 , wherein:
the primary front wheels are 1.25 times wider than the secondary front wheels and the primary rear wheels are 1.25 times wider than the secondary rear wheels.

17. The at least one truck of claim 15 , wherein:
the primary front wheels are 1.75 times wider than the secondary front wheels and the primary rear wheels are 1.75 times wider than the secondary rear wheels.

18. The at least one truck of claim 15 , wherein:
the primary front wheel width are equal to the primary rear wheel width, and the secondary front wheel width are equal to the secondary rear wheel width.

19. The at least one truck of claim 11 , wherein:
the two secondary front wheels are located closer together than the two primary front wheels;
the two secondary rear wheels are located closer together than the two primary rear wheels;
the two secondary rear wheels extend between the two primary front wheels; and
the two secondary rear wheels extend between the two primary rear wheels.

20. The at least one truck of claim 11 , wherein:
at least 75 percent of a weight of a rider is supported by the two primary front wheels and the two primary rear wheels.

Assignees

• Karsten Mfg Corp

Inventors

• Marusiak John R
• Solheim John A
• Cole Eric V

Classifications

• A63C17/004

  with auxiliary wheels not contacting the riding surface during steady riding · CPC title

• A63C17/012 Primary

  with a truck, i.e. with steering mechanism comprising an inclined geometrical axis to convert lateral tilting of the board in steering of the wheel axis · CPC title

• A63C17/0093

  Mechanisms transforming leaning into steering through an inclined geometrical axis, e.g. truck (A63C17/011 takes precedence) · CPC title

• A63C17/014

  Wheel arrangements · CPC title

• A63C17/00 Primary

  Roller skates; Skate-boards · CPC title