Land vehicles – Wheeled – Coasters
Reexamination Certificate
2001-09-21
2003-09-09
Johnson, Brian L. (Department: 3618)
Land vehicles
Wheeled
Coasters
C280S011280
Reexamination Certificate
active
06616155
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is related to a skate board, and more particularly to a resilient force-adjusting structure for skate board, which enables a user to easily adjust the resilience of the skate board.
FIG. 1
shows a part of a conventional skate board. The bracket body
10
is composed of an upper bracket
12
and a lower bracket
14
pivotally connected with each other. The upper bracket
12
can swing left and right relative to the lower bracket
14
. The step board
16
is fixedly mounted on the top face of the upper bracket. Two wheels
18
are respectively pivotally connected to two sides of the lower bracket. A resilient mechanism is mounted in the bracket body.
The resilient mechanism includes two resilient members
20
respectively mounted on two sides of the bracket body. Each resilient member has an upper and a lower spring seats
22
,
24
and a spring
25
. The upper and lower spring seats
22
,
24
are respectively locked on upper and lower brackets
12
,
14
by screws
23
passing through through holes
15
thereof. The spring
25
is fitted between the two spring seats
22
,
24
. When a user treads the step board
16
and makes it inclined, the skate board can be controlled and turned. The resilient members
20
provide a restoring force for the upper bracket.
In the above arrangement, the springs
25
have constant resilient force. Therefore, when adjusting the resilient state between the upper and lower brackets, the position of the resilient members must be changed. As shown in
FIGS. 1 and 2
, each side of top face of each of the upper and lower brackets
12
,
14
is formed with three through holes
15
. When the resilient member
20
is locked at the outermost through hole
15
a
, a maximum resilient force is achieved. Reversely, when the resilient member
20
is locked at the innermost through hole
15
b
, a minimum resilient force is provided.
In the case that the user is not satisfied with the maximum resilient state of the resilient member, as shown in
FIG. 2
, a column-like rubber bar
26
can be fitted in the spring
25
, whereby the upper and lower spring seats
22
,
24
can compress the rubber bar
26
to enhance the resilience of the resilient member.
However, the above structure still has some shortcomings as follows:
1. When adjusting the resilient energy of the resilient members, it is necessary to detach the upper and lower spring seats
22
,
24
and then lock the same at other through holes
15
. Such procedure is quite troublesome and time-consuming. Also, it is inconvenient to add the rubber bar
26
into the spring.
2. There are only three positions for the resilient members to change the resilient force. In other words, the resilient force can be only adjusted stage by stage so that the variation of the resilience is limited and it is impossible to precisely adjust the resilient force.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a resilient force-adjusting structure for skate board, which enables a user to easily adjust the resilience of the skate board.
It is a further object of the present invention to provide the above resilient force-adjusting structure for skate board, which enables a user to micro-adjust the resilience of the skate board within a larger range.
The present invention can be best understood through the following description and accompanying drawings wherein:
REFERENCES:
patent: 1401444 (1921-12-01), Roberts
patent: 1499448 (1924-07-01), Crawford
patent: 1549509 (1925-08-01), Schluesselburg
patent: 2275035 (1942-03-01), Pardon
patent: 2330147 (1943-09-01), Rodriguez
patent: 2557331 (1951-06-01), Wintercorn
patent: 5114166 (1992-05-01), McCosker
patent: 5161810 (1992-11-01), DeCesare
patent: 5997018 (1999-12-01), Lee
patent: 6158752 (2000-12-01), Kay
patent: 6244605 (2001-06-01), Liu
patent: 6286843 (2001-09-01), Lin
patent: 2002/0096846 (2002-07-01), Chen
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