Patent Application
20050246909
This invention relates to archery equipment and more particularly to a sighting apparatus for use with an archery bow, generally referred to as a bow sight. In particular, the bow sight of this invention provides vertical sighting compensation.
Many bow sight designs and configurations are known. Bow sights generally have multiple sight points for shooting arrows at targets positioned at different distances from the archer. Many bow sights include multiple sight points attached to horizontal pins; examples of such bow sights are shown, for example, in U.S. Pat. Nos. 5,103,568; 5,676,122; and 5,685,081. A more recent development has been a bow sight with vertical pins. An example of a bow sight having vertical pins and a fiber optic sight point at the end of the pins is shown, for example, in U.S. Pat. No. 6,418,633. A number of U.S. patents disclose bow sights having various other arrangements of sight points. See, for example, U.S. Pat. Nos. 3,234,651; 4,120,096; 5,086,567; and 5,131,153.
Bow sights have typically been designed to provide accurate sighting over changing distances where the elevation difference between the target and the shooter remains relatively constant. In other words, the position of each sight point is adjusted to effectively target an object at a set distance measured from the shooter while the vertical displacement, or elevation, between the shooter and the target is assumed to be constant. As such, if a bow having sight points adjusted to be accurate over level ground is used to shoot at a target located either above or below the shooter, the resulting shot will be off target. For example, if the target is below the shooter, the sight will overcompensate for the arrow drop due to gravity and the shot will be too high.
To ensure accuracy, traditional sight points require recalibration and manual readjustment whenever the relative elevation difference between the shooter and the target is varied. Pendulum style bow sites have been developed that automatically adjust to maintain accuracy when the bow is used to shoot targets located at different elevations relative to the shooter. See, for example, U.S. Pat. Nos. 6,145,208; 5,253,423; and 5,121,547; see also U.S. patent application Ser. No. 10/661,918 filed Sep. 12, 2003, which is incorporated herein by reference. Nonetheless, the current sights in this field can be improved with respect to their accuracy, ease of use, reliability, and simplicity.
One aspect of the present disclosure relates to a method of targeting. The method includes positioning a sight point so that the sight point can be used to shoot targets located at different positions relative to the shooter. Another aspect of the present disclosure relates to a sighting arrangement for facilitating the practice of the above-identified method.
In the following description of the preferred embodiment, reference is made to the accompanying drawings, which form a part hereof, and in which is shown, by way of illustration, specific embodiments in which the invention may be practiced. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the present invention.
Referring now to the figures, wherein like features are referenced with like numerals, a bow 10 is shown in
Bow 10 is illustrated as a compound bow, with pulley or cam 42 at the end of lower arm 22 and pulley or cam 44 at the end of upper arm 24. A bowstring 40 extends along the length L of the bow 10 between cam 42 and cam 44. Cams 42, 44 provide a mechanical advantage to the archer when drawing bowstring 40. As shown, a peep sight 46 may be positioned on bowstring 40 to facilitate targeting and aiming.
Mounted on handle 25 of bow 10 is a bow sight 100, which facilitates targeting; that is, bow sight 100 includes a device that can be calibrated to be used to situate the bow so that it accurately shoots arrows at targets position at particular distances and/or directions from the shooter.
Referring to
Referring to
To shoot the bow, the archer draws the string 40 and then peers through the peep sight 46 to locate the target. The archer precisely aims the bow 10 by establishing a sight line that extends from the peep sight 46 through the sight point 122 to the target. Once the peep sight 46, the sight point 122, and the target are all aligned, the string 40 is released to shoot the arrow at the target. When shooting from elevations higher than the target (e.g., a tree stand), the pendulum effect of the bow sight 100 moves the sight point 122 upwardly in the transverse height direction F as compared to a pin that does not pivot so that the arrow shoots lower to compensate for the downward angle of the sight line. As shown in
According to the present disclosure, the sight point 122 can set at a particular location toward or away from the target shooter. When the sight point is adjusted away from the shooter and towards the target, the sight point 122 is moved further upward in the transverse height direction when the bow 10 is aimed downward. As illustrated, the sight point 122 in position C, which is adjusted away from the shooter and towards the target, is relatively higher than the sight point in position B. It should be understood that the method could also be practiced without using a peep sight 46. In some embodiments, the shooter is trained to shoot accurately without relying on any type of rear sight. In other embodiments a rear sight is attached to the frame of the bow 10 rather than the bowstring 40.
Referring back to
Pivotally attached to housing support structure 110 is a plurality of sight pins 120, each pin 120 defining a sight point 122. In the embodiment illustrated, sight pins 120 are movably attached to a sight window 130, which is pivotally attached to support structure 110 at pivot axis 140. Pivot axis 140 extends generally horizontal to the ground and perpendicular to bow handle 25, so that pivoting of sight window 130 around pivot axis 140 produces swinging movement of sight window 130 away from support structure 110 and the archer in a pendulum-like manner. It is preferred that sight window 130 encompasses and encircles pins 120 at least partially, so that pins 120 are positioned within sight window 130. Similarly, it is preferred that support structure 110 encompasses and encircles sight window 130 at least partially. Housing support 110 and sight window 130 are shaped and sized so that sight window 130 can pivot within support structure 110 around pivot axis 140. A stop may be positioned on housing 110, on window 130, or both, to inhibit the movement of window 130 in relation to support 110. In the embodiment illustrated, a bumper stop 133 extends from housing support structure 110 to limit window 130 from swinging forward of support structure 110. Window 130 includes a notch to accept stop 133.
It should be understood that the sight window 130 can be constructed such that it tends to pivot away from the support structure 110 whenever the bow 10 is orientated such that the sight line that extends between the peep sight 46 and the sight point 122 is orientated at a negative angle (i.e., downward angle) with respect to a horizontal plane. One way to accomplish the above object is to construct the sight window 130 such that it is substantially balanced about the pivot axis 140. Such a construction can, for example, include incorporating a counter weight 180 on the sight window 130. In the embodiment shown in
Sight pins 120 support or otherwise define sight points 122, which the archer uses for targeting an object. Sight point 122 may be integral with pins 120 or be a separate piece from pins 120. A sight or sighting point is any shape, point, or indicia of any sort that is visually placed in line with the target to be shot at for assisting in the proper aiming of the bow. Sight points 122 can be circular shapes, other geometrical shapes, colored dots, painted dots, the end of a light gathering cable, or simply the end of sight pins 120, for example. Although five pins 120 and their respective sight points 122 are illustrated in the figures, it is understood that any number of pins 120 and sight points 122 can be utilized; in most embodiments, however, at least one pins 120 will be present. Pins may be straight as shown in
In a preferred embodiment, sight pin 120 is a pin constructed to support a sight point 122. An end of a fiber optic cable may be positioned at the end of sight pin 120 to act as sight point 122. The fiber optic cable collects light along its length, and the light exits the end of the cable forming sight point 122. The fiber optic cable may be held in place by a slit or other aperture located near the end of pin 120. Since the fiber optic cable collects light along its length, sight points 122 that are associated with long fiber optic cables that are exposed to light are brighter than sight points 122 that are associated with short fiber optic cables that are not exposed to light. As such, in some embodiments the sight points 122 are associated fiber optic cables that are coiled around the structure of the bow sight 100 that is exposed to light, for example, the fiber optic cable 166 (shown in
The preferred pins 120 for use with bow sight 100 are vertical pins, or, pins that have a vertical component so that at least a portion of the pin extends in a vertical direction. As used herein, a pin is considered a vertical pin if the pin has a vertical portion (i.e., a portion aligned in a vertical plane). Additionally, in a preferred embodiment, multiple pins are positioned so that they are aligned when viewed by the archer in the shooting position. The benefit of vertical aligned pins is discussed, for example, in U.S. Pat. No. 6,418,633, which is incorporated herein by reference. Preferably, when multiple vertical pins are aligned, the archer is able to view the sight point of each pin, but only views the widest pin. Though only vertical pins are shown in the figures, non-vertical pin arrangements in accordance with the present disclosure are also possible. For example, the pins can be horizontal meaning, when viewed by the archer in the shooting position, pins 120 extend from the left or right side of support housing 110 into the field of view. In such an embodiment, the horizontal pins can be housed in vertical slots to allow for vertical adjustment and the vertical slots can be slidably engaged with horizontal slots to allow for front to back adjustment of the pins without effecting the vertical position of the pins.
As stated above, pins 120 are preferably movably attached to sight window 130, although in some embodiments, the entire pin 120 is not moveable and only the sight points 122 are moveable in relation to sight window 130. In the embodiment illustrated in
Still referring to
To use bow sight 100, an archer would first mount bow sight 100 onto bow handle 25 via mounting brackets 115. The shortest yardage pin (typically a 20 yard pin) is moved up or down in the transverse height direction to provide accurate targeting when the sight point 122 is aligned with a target at roughly the same elevation as the shooter. Sight window 130 can be locked in relation to housing support structure 110 for convenience while making this adjustment. After positioning sight point 122 while on flat ground, the transverse height position of pin 120 need not be loosened or adjusted again. Once positioned, any locking mechanism is unlocked so that sight window 130 is free to pivot around axis 140 in relation to support structure 110 and bow handle 25.
The bow sight is then targeted on an object positioned on a slope, typically a downward slope. A downward slope of 30 to 45 degrees is typical for shooting from a tree stand. Angling the bow 10 down will cause sight window 130 to swing down and away from the archer. To target the bow on a slope, the sight point 122 is adjusted by moving the sight pin 120 towards or away from a target using slider 125 in casing 135, while maintaining the verse height position of the sight point 122. In other words, in the illustrated embodiment, the verse height position of sight point 122 relative to the sight window 130 does not changed when the sight point is moved towards or away from the target. In the illustrated embodiment, the entire pin 120 moves forward or backwards relative to the sight window 130.
It should be appreciated that numerous other front to back adjustment configurations are possible according to the disclosure. For example, in some embodiments slider 125 includes a discrete number of front to back locations that are constructed to receive or interlock with the pin 120 once it is adjusted in the transverse height direction. In other embodiments the slider includes a high friction material such as rubber that interfaces with the pins so that the pins can be adjusted by simply pushing them back and forth, yet they stay in place during ordinary use once initially set. In other embodiments the pins can include a spring loaded securing arrangement that holds the pins in place unless the shooter depresses the spring for adjustment. In should also be appreciated that in alternative embodiments, the sight point 122 need not be sighted in for one horizontal shot and one sloped or angled shot. For example, the sight point 122 can be sighted in for two different sloped or angled shots.
Transverse height adjustment of sight points 122 is accomplished via transverse height adjustment mechanism 160; in a preferred embodiment, transverse height adjustment of sight point 122 is accomplished by transverse height adjustment of pins 120. Transverse height adjustment mechanism 160 can be any structure that allows movement of and then locks sight point 122 in relation to structure 150. Examples of suitable mechanism 160 include setscrews, geared cams, worm gears, locking cams, and threads on the pins. Example gear and cam arrangements are disclosed in U.S. Pat. No. 6,418,633, which was previously incorporated herein by reference. In other embodiments, the transverse height position of the sight points 122 can be achieved by moving the entire sight up or down relative to the bow handle. In embodiments where the vertical adjustment mechanism includes cams or gears, the cams or gears can be arranged such that they can be moved towards and away from the shooter to allow for front to back adjustment of the sight pins. One such arrangement would include mounting the cams or gears on a slide or track.
Referring to
The target viewing window opening 116 is relatively open so as to provide a relatively large and clear field of vision to facilitate aligning the target relative to the sight point 126. The target viewing opening 116 in some embodiments is unobstructed such that it includes no structures therein that are not constructed to be visually helpful in properly aligning the sight point 126 with the target. Unobstructed sight windows may, nonetheless, include the shaft 128 of a sight pin 112 and other structures for facilitating aiming a bow 10 such as a level 133.
In the embodiment shown, the frame 110′ defines a generally circular and visually continuous target viewing opening 116. In addition, the frame 110′ and the target viewing opening 116 include a ratio of the maximum width of the frame 110′ (Fmax) to the maximum width of the target viewing opening 116 (Smax) that is no more than 1.5. With such a ratio the frame 110′ and the target viewing opening 116 are relatively close in size. In the embodiment shown, the frame surrounds the sight point 126 to protect it from external impact.
As shown in
The second frame member 134 can be U-shaped in that it includes two opposed connected arms 142. In the embodiments shown, the arms 142 define a generally semi-circular shape. The arms 142 are positioned to straddle the exterior of the upper partial ring 121. The two arms 142 can include pivot pins 146, such as screw, for attachment of the second frame member 134 to the upper partial ring 121. The pivot pins 146 define a pivot axis PA of the second frame member 134. The pivot axis PA preferably is oriented to intersect the target viewing opening 116. However, as discussed above, it is preferred for the target viewing opening 116 to be substantially free of obstructions. Therefore, while the pivot axis PA intersects the target viewing opening 116, it is preferred that no portion of the pivot pins 146 substantially projects into or across the target viewing opening 116.
The support frame 110′ can also include one or more stops 154, which limit the range of motion of the second frame member 134 relative to the first frame member 114. In the embodiment shown, the stops are shown as bosses. In addition to the stops 154, the bow sight 100′ includes a locking mechanism for limiting the range of pivotal movement of the second frame member 134 relative to the first frame member 114, and for selectively locking the second frame member 134 in the position of
Referring to
The sight point 126 is preferably an optical sight point defined by the end of a light collecting member such as an optical fiber 166. In such embodiments, the end of the fiber optic cable 166 is secured to the free end of a relatively rigid supporting pin 112 to act as a sight point 126. Since the optical fiber 166 collects light along its length, to maximize the brightness of the sight point, it is desired to provide an increased length of optical fiber 166. To increase the length of optical fiber 166, the optical fiber 166 extends downwardly from the sight point 126 along the back side of the pin 112 and is wrapped multiple times about the exterior of the hub 168.
The sight can also include a slide arrangement 170 supported on the second frame member 134. The slide arrangement 170 includes a block 174 slidably mounted within a track 171 that extends in a front-to-back direction. The pin 112 is mounted to the block 174 such that the front-to-back position of the pin 112 can be adjusted by sliding the block 174 forwardly or rearwardly within the track 171. A first set screw 172 (see
The block 174 can be also constructed to receive a second set screw 175 (see
The slider arrangement 170 could include many alternative features for enabling the sight pin 112 to be conveniently adjusted along the track 171. For example, the slider arrangement 170 could include a spring loaded mechanism instead of a first set screw 172 so that the sight pin 112 can be adjusted with one's fingers without the need to use any tools.
Alternative mechanisms for setting the transverse height of the pin 112 are also available. For example, the pins 112 can be constructed of multiple parts that telescope to allow for adjustment in the transverse height direction. Also, the pins 112 can be simply bent forward or backwards for the transverse height adjustment. In other embodiments, the pins 112 can be threaded into the block 174 and can be moved upward or downward by twisting the pins 112. Yet in other embodiments the transverse height of the pin 112 can be adjusted by moving the entire sight using a gear mechanisms such as the type disclosed in U.S. patent application Ser. No. 10/661,918 incorporated herein by reference in its entirety.
The disclosure is also directed to a method of assembling the bow sight 100′ that includes at least the steps of providing a lower partial ring 132 and a frame member 114 and coupling the lower partial ring 132 to the frame member 114 such that the lower partial ring 132 and the frame member 114 define an unobstructed sight window and the ring is pivotally movable with respect to the frame.
Support structure 110 may include a dampening system to reduce vibration caused when bowstring 40 is released. An example of a suitable dampening system includes a material that is softer than the material that makes up the part of the bow handle 25 to which the device is directly attached, such that the dampening system at least partially absorbs the vibrations caused by the release of bowstring 40 when shooting an arrow. Dampening systems are described, for example, in U.S. Pat. No. 6,418,633, which is incorporated herein by reference.
The materials for bow sight 100 can include metals (e.g., aluminum, steel, brass), plastics (e.g., polycarbonate, acrylics), and ceramics and composite materials. Such materials can be used for any of support structure 110, mounting bracket 115, sight window 130, and any other portion of bow sight 100. Pins 120 are preferably a rigid material, such as metal. Any or all of these pieces may include a coating thereon.
In the depicted embodiment, the rings have generally circular shapes. However, as defined herein, the term “ring” is not limited to circular shapes. To the contrary, square rings, oval rings, and other shapes suitable for framing a target viewing opening are included within the definition of ring. The term “viewing opening” includes fully enclosed openings as well as partially enclosed openings such as U-shaped openings (e.g., openings with closed bottoms and sides and opened tops) as well as other partially enclosed openings. As used herein, a full ring means a ring that forms an endless boundary about the target viewing opening 116. A substantially full ring means a ring that forms a boundary that surrounds at least 75% of the target viewing opening 116. A partial ring means a member that forms a boundary that surrounds less than 75% of the target viewing opening 116. A “half ring” means a member that forms a boundary that surrounds approximately 50% of the target viewing opening 116.
Structures through which a target can be viewed can be referred to as target viewing channels, sighting openings, sight windows, or like terms. Structures for supporting a sight pin, such as the lower partial ring 132, can be referred to as pin supports, pin support members, sight point supports or sight pin support members. Structures capable of swinging about a pivot can be referred to as pivot members, pendulum members, pendulums, or like terms. Structures capable of protecting pins can be referred to as cages, protective members, shielding members or like terms.
The above specification and examples provide a complete description of the manufacture and use of the invention. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the present invention. Although a bow sight has been described, the details of this invention can be incorporated into other projecting shooting applications and systems, such as sights for rifles and shotguns. Since many embodiments of the invention can be made without departing from the spirit and scope of the invention, the invention resides in the claims hereinafter appended.
This application is a continuation-in-part of application Ser. No. 10/661,918 filed Sep. 12, 2003, which application claims the benefit of provisional application Ser. No. 60/410,877 filed Sep. 13, 2002, both of which are incorporated herein by reference in their entireties.
| Number | Date | Country | |
|---|---|---|---|
| 60410877 | Sep 2002 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 10661918 | Sep 2003 | US |
| Child | 11095041 | Mar 2005 | US |
