Patent Application
20250213958
The invention relates to truck assemblies and more particularly to a swivel axle bracket of a truck for a skateboard or the like.
With the rapid development of the economy, residents' income and living standards are gradually improving. Many young people are pursuing sports that are both stimulating and entertaining. Skateboarding is an action sport that involves riding and performing tricks using a skateboard and has become popular throughout the world. It has the advantages including compactness, light weight, portability, and being suitable for a wide age range. It is especially popular among skateboarder.
However, the conventional four-wheel skateboards commercially available on the market have the following drawbacks in use: the movements during rapid small-angle turns are not precise enough, and due to the incompatibility or inadequate assembly of the spring with the housing and the axle bracket, and friction noise is generated.
Thus, there is a need for a swivel axle bracket of a truck for a skateboard that can move accurately and run quietly in use.
In view of the above identified drawbacks, the invention provides a swivel axle bracket of a truck for a skateboard to solve the problems experienced by conventional art.
In order to achieve the above objectives, the invention provides a truck assembly, comprising a housing including an annular groove member in an underside; an axle bracket including an upper annular groove at an intermediate portion; a coil spring disposed in both the annular groove member and the upper annular groove wherein the coil spring includes a smaller first end fastened in the annular groove member, and a smaller second end fastened in the upper annular groove; a mounting pin; a first bearing; a second bearing; a hollow spacer; and a nut; wherein the mounting pin is driven through the housing, the first bearing, the axle bracket, the second bearing, and the hollow spacer to be secured to the nut so that the axle bracket is configured to swivel to twist the coil spring, the twisting of the coil spring stores energy, and in response to the twisting is stopped, the energized coil spring releases energy to turn the axle bracket to an inoperative position.
Preferably, the first bearing is anchored on a top of the bossed hole; wherein the second bearing is disposed in the lower annular groove; the hollow spacer includes a flange aligned with a central portion of the second bearing; the mounting pin passes through the flange of the hollow spacer; and an end of the mounting pin is secured to the nut.
Preferably, the axle bracket further comprises two axles each passing through a wheel to be secured to the nut.
Preferably, the housing further comprises a plurality of threaded holes on a top, and the housing is secured to a deck of a skateboard by a plurality of screws driven through the deck into the threaded holes.
The invention has the following advantages and benefits in comparison with the conventional art:
When used for a long time, the grooves of both the axle bracket and the housing become wider due to compression and expansion of the coil spring. The coil spring is securely fastened in the grooves under the axial pressure thereof so that the movement of the skateboard can be more precise and the action is quiet during use. The truck is characterized by having a simple structure, a stable operation, flexible steering, and a reliable assembly, and being particularly suitable for skateboards, surfboards, and other related products.
The above and other objects, features and advantages of the invention will become apparent from the following detailed description taken with the accompanying drawings.
Referring to
A housing 1 includes an annular groove member 11 in an underside, a longitudinal through hole 12 communicating with the annular groove member 11, and a plurality of threaded holes 13 on a top. The housing 1 is secured to a deck 101 of a skateboard 100 by driving a plurality of screws 102 through the deck 101 into the threaded holes 13.
An axle bracket 2 includes two axles 21 each passing through a wheel 9 to be secured to a nut 10 so that the wheels 9 are mounted. The axle bracket 2 further comprises an upper annular groove 22 at an intermediate portion, a lower annular groove 23 in an underside, and a bossed hole 24 through the upper annular groove 22 and the lower annular groove 23.
A first bearing 5 is anchored between a top of the bossed hole 24 and the underside of the housing 1. A coil spring 3 is disposed in the annular groove member 11 and the upper annular groove 21. The first bearing 5 is disposed in the coil spring 3. The coil spring 3 includes a smaller first end 31 fastened in the annular groove member 11 (i.e., the smaller first end 31 being secured to the housing 1), and a smaller second end 32 fastened in the upper annular groove 22 (i.e., the smaller second end 32 being secured to the axle bracket 2).
A second bearing 6 is disposed in the lower annular groove 23 and fastened by a shoulder between a flange 71 of a hollow spacer 7 and a top surface of the hollow spacer 7. A mounting pin 4 is driven through the through hole 12, the first bearing 5, the bossed hole 24, the second bearing 6, and the flange 71 of the hollow spacer 7 to be secured to a nut 8.
The axle bracket 2 is configured to swivel. Thus, a lower portion of the coil spring 3 turns about the mounting pin 4, i.e., being twisted. That is, the axle bracket 2 may swivel. For example, as shown in
When used for a long time, the grooves of both the axle bracket 2 and the housing 1 become wider due to compression and expansion of the coil spring 3. The coil spring 3 is securely fastened in the grooves under the axial pressure thereof so that the movement of the skateboard can be more precise and the action is quiet during use.
The truck has the following characteristics: simple structure, stable operation, flexible steering, reliable assembly, etc. The truck is particularly suitable for skateboards, surfboards, and other related products.
While the invention has been described in terms of preferred embodiments, those skilled in the art will recognize that the invention can be practiced with modifications within the spirit and scope of the appended claims.
