Double bull's-eye device

A double bull's-eye device incorporated within a circular rib formed on a dart frame includes a base having a top end and a bottom end engagable with the circular rib, an outer bull's-eye sleeved from the top end on the base, and an inner bull's-eye passing from the top end through the base to be mounted on the base. Such double bull's-eye device can be incorporated to the dart frame easily.

FIELD OF THE INVENTION 
The present invention relates to a double bull's-eye device, and more 
particularly to a double bull's-eye device incorporated within a dart game 
without any securing part. 
BACKGROUND OF THE INVENTION 
A dart game is an interesting exercise equipment which has a dart panel 
including a bull's-eye and many concentric annular regions and radially 
divided into many sectorial blocks each of which is related to a specific 
score. 
Early dart games or devices had only one bull's-eye. Afterwards, people 
developed a dart device having double bull's-eyes by defining a smaller 
region inside the original bull's-eye so as to make two concentric 
circular regions; generally, the inner bull's-eye's score is higher than 
the outer bull's-eye's in order to challenge the player's darting accuracy 
and to advance the interest of the game. 
Relative references found about double bull's-eye device include R.O.C. 
Utility Model No. 192,984, U.S. Pat. Nos. 4,586,716 and 5,193,817. The 
U.S. Pat. No. 4,586,716 disclosed a double bull's-eye device formed by 
engaging an ax/al key way provided on the outer bull's-eye and an 
extension provided on the rib of the inner bull's-eye. The R.O.C. Utility 
Model No. 192,984 and the U.S. Pat. No. 5,193,817 correspondingly 
disclosed a similar double bull's-eye device which is formed by sleeving 
an inner circular target plate onto an annular support member sleeved onto 
an outer circular target plate and then securing the annular support 
member on a target frame with screws; but, such a dart device would have a 
higher cost due to the tedious assembly with screws. 
References: 
1. R.O.C. Utility Model No. 192,984 issued to Pan, Jong-Haw on Oct. 
11,1992. 
2. U.S. Pat. No. 4,586,716 issued to Brejcha et al. on May 6, 1986. 
3. U.S. Pat. No. 5,193,817 issued to Pan on Mar. 16, 1993. 
SUMMARY OF THE INVENTION 
The object of the present invention is to provide a double bull's-eye 
device capable of being incorporated within a dart game or device without 
any securing part. 
In accordance with the present invention, a double bull's-eye device 
adapted to be incorporated within a circular rib formed on a dart frame 
comprises a base having a top end and a bottom end engagable with the 
circular rib, an outer bull's-eye sleeved from the top end on the base; 
and an inner bull's-eye passing from the top end through the base to be 
mounted on the base. 
In accordance with the present invention, the base is a tubular member 
provided with at least one inner axial groove and at least one inner 
circumferential indentation, and including an intermediate shoulder and a 
bottom flange having a plurality of projecting parts which respectively 
have a plurality of through holes. 
In accordance with the present invention, the bottom flange has three 
projecting parts. 
In accordance with the present invention, the base has two inner axial 
grooves and two inner circumferential indentations. 
In accordance with the present invention, the outer bull's-eye has an 
annular wall having a plurality of axial indentations for respectively 
receiving therein the plurality of projecting parts and a plurality of 
feet for respectively passing through the plurality of through holes. 
In accordance with the present invention, the circular rib has a plurality 
of indentations for respectively engaging with the plurality of axial 
projecting parts. 
In accordance with the present invention, the inner bull's-eye further 
includes a hollow cylinder having a top end and at least one bottom 
projection for being inserted along the at least one inner axial groove 
and then to be retained respectively in the at least one inner 
circumferential indentation; and a ring provided on the top end of the 
hollow cylinder and protruding above the outer bull's-eye. 
The present invention may best be understood through the following 
description with reference to the accompanying drawings, in which:

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring to FIG. 1, the present double bull's-eye device 10 is adapted to 
be incorporated within a circular rib 11 formed on a dart frame 1, which 
includes a base 101 having a top end 1015 and a bottom end 1016 for being 
engagable with the circular rib 11, an outer bull's-eye 102 sleeved from 
the top end 1015 on the base 101 and an inner bull's-eye 103 passing from 
the top end 1015 through the base 101 to be mounted on the base 101. 
The base 101 is a tubular member provided with two inner axial grooves 
1013, two inner circumferential indentations 1014, an intermediate 
shoulder 1012 and a bottom flange 1011 having three projecting parts 10111 
each of which has one through hole 10112. The outer bull's-eye 102 has an 
annular wall having three axial indentations 1021 for respectively 
receiving therein the three projecting parts 10111 and three feet 1022 for 
respectively passing through the three through holes 10112. The circular 
rib 11 has three indentations 111 for respectively engaging with the three 
radial projecting parts 10111. The inner bull's-eye 103 includes a hollow 
cylinder 1031 having a top end, two bottom projections 10311 for being 
inserted along the two inner axial grooves 1013 and then retained 
respectively in the two inner circumferential indentations 1014 and a ring 
1032 provided on the top end of the hollow cylinder 1031 and protruding 
above the outer bull's-eye 102. 
To assemble the present double bull's-eye device 10, one will sleeve the 
outer bull's eye 102 onto the base 101, respectively engage the three 
axial indentations 1021 (shown in FIG. 1) with the three projecting parts 
10111, then respectively pass the three feet 1022 of the outer bull's eye 
102 through the three holes 10112 of the base 101 (shown in FIG. 2A), and 
finally mount the inner bull's-eye 103 on the circular tube of the base 
101 by rotating the two bottom projections 10311 to engage with the two 
inner circumferential indentations 1014 of the base 101 (shown in FIG. 
2B). The assembled double bull's-eye device 10 is incorporated in a 
circular rib 11 having three indentations 111 for respectively engaging 
with the three radial projecting parts 10111 so as to prevent the base 101 
from turning. 
Referring to FIGS. 2A and 2B, the dart device according to the present 
invention includes a dart frame 1 having a circular rib 11, a base 101, an 
outer bull's-eye 102, an inner bull's-eye 103, a conducting matrix device 
21 and a bottom cover 22. After the double bull's-eye device is assembled 
in the dart device, the inner bull's-eye 103 cannot be disengaged. Also, 
referring to FIGS. 3A, 3B and 3C, if the inner bull's-eye 103 is to be 
taken out, then one will have to press the inner bull's-eye 103 in the 
direction toward the conducting matrix device 21 and then rotate the inner 
bull's eye 103 in order to disengage the two bottom projections 10311 from 
the two inner circumferential indentations 1014 of the base 101; but due 
to the fact that the assembled double bull's-eye device 10 is stopped by 
the conducting matrix device 21 which is supported by the bottom cover 22, 
the inner bull's-eye 103 has no space to be pressed down and accordingly 
cannot be disengaged. As a result, when the outer bull's-eye 102 is 
darted, then it will axially move a distance to contact the conducting 
matrix device 21 with its feet 1022 so as to generate a signal; while when 
the inner bull's-eye 103 is darted, then the inner bull's-eye 103 will 
axially move a distance to contact the conducting matrix device 21 with 
the foot 1033 of the inner bull's-eye 103 so as to generate a signal. 
Preferably, the diameter 112 (shown in FIG. 1 ) of the outer bull's-eye 102 
is larger than that of the circular rib 11 and the inner bull's-eye 103 is 
retained in the base 101 by its bottom projections 10311 so as to ensure 
that the double bull's-eye device is secured in the dart frame 1 when the 
dart is to be pulled out of the dart frame 1. 
Referring to FIG. 4, another preferred embodiment of a double bull's-eye 
device 10 according to the present invention is similar to the previous 
preferred embodiment except that the base 101 is not provided with holes 
10112 and the three feet 1022 of the outer bull's-eye 102 respectively 
project through the intermediate recesses formed by every adjacent two of 
the projecting parts 10111 of the base 101. 
To sum up, the present invention provides a new double bull's-eye device 
which is adapted to be secured within a dart device without screws and can 
accordingly save the cost spent on the assembling procedure. 
While the invention has been described in terms of what are presently 
considered to be the most practical and preferred embodiments, it is to be 
understood that the invention need not be limited to the disclosed 
embodiment. On the contrary, it is intended to cover various modifications 
and similar arrangements included within the spirit and scope of the 
appended claims which are to be accorded with the broadest interpretation 
so as to encompass all such modifications and similar structures.