Geometrical instruments – Straight-line light ray type – Structurally installed
Reexamination Certificate
2000-01-26
2002-09-10
Bennett, G. Bradley (Department: 2859)
Geometrical instruments
Straight-line light ray type
Structurally installed
C124S087000
Reexamination Certificate
active
06446347
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention is related to a sight for an archery bow. In particular, -this invention is directed to a sight for an archery bow that maintains the axis of the sight normal to the archer's sighting eye.
2. Description of Related Art
FIG. 1
shows a perspective view of a conventional bow sight
10
. The bow sight
10
is attached to a bow (not shown) by a support bar
12
. The support bar
12
supports a frame
14
which retains a lead screw
16
. The lead screw
16
is connect to a knurled adjusting knob
18
. The lead screw
16
is threadably entrained within an elevation block
20
that may be moved upward or downward, as shown by arrow A, by rotating the knurled knob
18
. The elevation block
20
is connected to a sighting device
22
through a windage block
28
. Therefore, by turning the adjusting knob
18
, the sighting device
22
may be moved upward or downward to adjust the elevation of flight of an arrow from the bow.
The elevation block
20
also includes a transversely extending screw
24
that is attached to a knurled knob
26
. The transversely extending screw
24
is threadably entrained by the windage block
28
. The windage block
28
is connected to the sighting device
22
. An archer may adjust the sighting device
22
by rotating knurled knob
26
and moving the sighting device
22
in the direction of arrow B to adjust for wind.
One of the problems with the conventional bow sight that was discovered by the inventor is that an archer's line of sight through the sighting device
22
may not be normal to the sighting device
22
.
FIG. 2
shows an archer
30
using a conventional sighting device
10
to sight a target
32
.
FIG. 2
shows that the axis &agr; of the sighting device of the bow sight
10
does not coincide with the line of sight &bgr; of the archer
30
to the target
32
. The angle &ggr; between the axis a and the line of sight &bgr; causes error in the sighting of an arrow to the target
32
. In the example shown in
FIG. 2
, the archer's line of sight &bgr; falls on the target
32
at a point that is lower than the point on the target
32
upon which the axis &agr; of the sighting device of the bow sight
10
falls. Thus, the archer's line of sight &bgr; does not provide a correct sight that corresponds to the axis &agr; of the sighting device of the bow sight
10
.
An exemplary sighting device of the bow sight
10
is a lens
34
carrying a filament
36
as shown in
FIGS. 1
,
3
and
4
.
FIG. 3
shows an exemplary sight picture of an archer
30
when the axis &agr; of the sighting device
22
does not coincide with the line of sight &bgr; of the archer
30
. With this sight picture a portion of the length of the filament
36
is visible to the archer. Therefore, the filament
36
is not focused and appears to have a height h that is greater than the radius r of the filament
36
.
FIG. 4
shows a correct sight picture. In particular, the sight picture shown in
FIG. 4
is provided when the line of sight &bgr; of the archer coincides with the axis &agr; of the sighting device
22
. The sight picture of
FIG. 4
provides an accurate aim to a target while the sight picture of
FIG. 3
does not provide an accurate aim.
SUMMARY OF THE INVENTION
An exemplary embodiment of a bow sight in accordance with the present invention provides a frame and an elevation block that cooperate to maintain the approximate coincidence of the axis &agr; of the sighting device
22
with the line of sight &bgr; of an archer. An exemplary embodiment of the invention maintains this coincidence even when the bow sight is adjusted for elevation. The exemplary embodiment of the bow sight of the present invention has a frame with radiused guide ways through which the elevation block of the sighting device travels when being adjusted for elevation. In other words, even though the elevation and windage of the sighting device may be adjusted, the sighting device is always normal to the line of sight of the archer. The radius of the radiused guide ways approximately corresponds to the distance from the archer's eye to the sighting device
22
on the bow sight
10
.
Another exemplary embodiment of the present invention includes a quick release carrier for the sighting device. The quick release carrier maintains the alignment of the sighting device with the archer's line of sight. Therefore, the exemplary bow sight of the invention may have the sighting device removed from the bow sight for storage and the bow sight may be reassembled without affecting the alignment of the sighting device with the archer's line of sight when the sighting device is removed and replaced.
Yet another exemplary embodiment of the bow sight in accordance with the present invention also includes a frame that is of a configuration that may be extruded prior to machining. Conventional bow sight frames are difficult to manufacture. By contrast, the frame of the bow sight in accordance with the present invention may be easily manufactured by extruding and subsequent machining. The frame is also unique in that it completely encloses a void or hollow space.
These and other features and advantages of this invention are described in or are apparent from the following detailed description of the preferred embodiments.
REFERENCES:
patent: 2959860 (1960-11-01), Kowalcyk
patent: 3487548 (1970-01-01), Frydenlund
patent: 4142297 (1979-03-01), Altier
patent: 4153999 (1979-05-01), O'Steen
patent: 4167333 (1979-09-01), Young et al.
patent: 4669196 (1987-06-01), Kersey
patent: 5092052 (1992-03-01), Godsey
patent: 5465491 (1995-11-01), Thell
patent: 5524601 (1996-06-01), Slates et al.
patent: RE36266 (1999-08-01), Gibbs
patent: 6119672 (2000-09-01), Closson
patent: 6134794 (2000-10-01), Raukola
Bennett G. Bradley
Molldrem, Jr. Bernhard P.
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