High performance roller bearing yo-yo

Details High performance roller bearing yo-yo High performance roller bearing yo-yo

2000-09-01

2003-05-20

Banks, Derris H. (Department: 3712)

Amusement devices: toys

Rotating or having visible rotating portion

Having attached cord for imparting rotation

C446S247000

Reexamination Certificate

active

06565408

ABSTRACT:

TECHNICAL FIELD
The invention relates to yo-yos and in particular to high performance roller bearing yo-yos.
BACKGROUND OF THE INVENTION
A typical prior art roller bearing yo-yo consists of two disk-like yo-yo halves attached at their center by an axle, and a roller bearing slidably mounted to the axle between the yo-yo halves.
FIG. 6
is a cross-section view of a particular prior art roller bearing yo-yo. This yo-yo includes an axle
74
, an inner shell
72
fixedly mounted to the axle by axle threaded end
80
screwed into embedded hex nut
82
of inner shell
72
. Outer shell
71
is fixedly attached to inner shell
72
. Roller bearing
76
is slid onto the axle and is held in place between facing rims
83
of two spacers
75
. Facing rims
83
of the two spacers pinch race
84
of the roller bearing between the halves of the yo-yo. The two spacers are located in spacer pockets
73
which are defined by inner shells
72
. Facing rims
87
constrain the strings axial travel on the roller bearing to prevent the string from sliding off the edges of the circumferential surface of the bearing.
Prior art roller bearing yo-yos use single loop stringing because multiple loops of string would cause binding between the bearing and spacer faces
87
and between the bearing and starburst region
88
. This would prevent the yo-yo from sleeping. In the single loop stringing method, the string is merely looped around the roller bearing. This allows clearance between faces
87
, thereby allowing the roller bearing yo-yo to sleep.
However, prior art roller bearing yo-yos have two disadvantages that limit performance as follows: (1) The sliding of the string around the surface of the roller bearing absorbs energy; and (2) the single loop stringing method allows the string to float from side-to-side across the relatively wide circumferential surface of the roller bearing race
85
, which is undesirable because the string, not being centered, will tend to rub on facing rims
87
of the spacer and inner shell starburst regions
88
.
SUMMARY OF THE INVENTION
A yo-yo according to the present invention includes a first yo-yo half defining a first starburst, a second yo-yo half defining a second starburst, and an axle fixedly mounted between said yo-yo halves. The yo-yo also includes a roller bearing fixedly attached to the axle, and a spool fixedly attached to the roller bearing, the spool having a circumferential outer rim with a groove therein. A bearing pocket defines an annular radial gap between each yo-yo half and the outer rim, the gap sufficiently small that a string cannot wedge in the gap.


REFERENCES:
patent: 3175326 (1965-03-01), Isaacson
patent: 4130962 (1978-12-01), Ennis
patent: 4895547 (1990-01-01), Amaral
patent: 5100361 (1992-03-01), Kuhn et al.
patent: 5254027 (1993-10-01), McAvoy, Jr.
patent: 5389029 (1995-02-01), McAvoy, Jr.
patent: 5951361 (1999-09-01), Van Dan Elzen et al.
patent: 5984759 (1999-11-01), O'Sullivan
patent: 6004183 (1999-12-01), Dixon et al.
patent: 6162109 (2000-12-01), Baier
patent: 6196890 (2001-03-01), Amaral
patent: 6196891 (2001-03-01), Jamison
patent: 6254452 (2001-07-01), Adler
patent: 411137859 (1999-05-01), None
patent: 11253662 (1999-09-01), None
patent: WO 00/50139 (2000-08-01), None

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