Patent Publication Number: US-7721453-B1

Title: Calibrated archery bow sight

Description:
This application claims priority to Provisional Application 60/982,879 filed with the United States Patent and Trademark Office on Oct. 26, 2007. 

   BACKGROUND OF THE INVENTION 
   In the field of archery, target sights have become as important as the bow itself. Conventional bow sights may include a number of sight pins that are manually set by the archer to sight in the arrow. Sighting requires the archer to make repeated releases toward a target located at a predetermined distance while making fine adjustments to the corresponding sight pin. This process is repeated for each desired distance and is known by archers to become cumbersome and time consuming, particularly when sighting multiple bows. Although providing a method for greater accuracy, the presence of multiple sight pins obscures the view of the target and requires the archer to remember the value of each pin while estimating when targets are located between the sighted values. 
   Efforts have been made to develop archery sights having a single pin capable of vertical adjustments to mimic the theory of multiple sight pins. However, these sights require the same process of fine adjustments for multiple sighting distances repeated for each bow. Like the multiple-pin sights, the archer is required to use two hands to make vertical adjustments to the single sight pin while remembering the scaled setting that applies to each predetermined distance. Therefore, the need for marking each pre-calibrated distance offers little to address the time-expense issue that is much needed in the art. 
   More recently in the art, moveable-pin sights offer the archer the ability to sight in an arrow using a graduated scale, whereby the vertical positioning of a single sight pin corresponds to a yardage scaled tape prepared by the archer. As known in the art, bow speed impacts the required trajectory necessary to for the bow to travel to the target. Due to this mathematical principle, greater adjustments in the angle of trajectory are required, when attempting to hit a target with a slower bow. The advantage of a real world scale removes the guesswork necessary by the archer; however, each tape used is sighted for a specific bow speed and arrow. As a result the moveable-site cannot be used on multiple bows without creating multiple, removable, scaled tapes. 
   SUMMARY OF THE INVENTION 
   The current invention fulfills a much needed advance in the art of archery bow sights comprising the manual translation about a vertical arc while in full-draw with a permanent real-world scale disposed on a calibrated range dial. Requiring only two sight-in distances, the presence of a real-world scale provides a visual indication of subsequent calibrated yardage distances, alleviating the time consuming process currently required to effectively sight-in a bow. Using known mathematical principles of trajectory, a fully scaled measurements ranging from distances from ten to one-hundred yards are available to the archer after using the dual sighting process of the current invention. To achieve this, a sliding sight arm allows adjustments to the bow sight to distances closer or further away from the archer&#39;s visual perspective to effectively increase or decrease the vertically arced displacement of the sight for ready adaptability to any bow speed. In an alternative embodiment, the device can be outfitted with reference marks showing the correct projected and vertical distance of the sight allowing the device to be transferred to previously sighted bows to provide an accurate sight-in starting location or even eliminating the need to repeat the sighting-in process all together. 
   The twenty-yard setting of the present invention is visually indicated to the archer on a graduated wheel located in the visual field when in full-draw. In this location, the sliding sight arm on which a standard bow sight is seated will always land in a position that is perpendicular to the bow when held in proper full draw position by the archer. In this position, fine adjustments to the vertical positions of the bow sight are made through a progression of multiple releases until the twenty yard distance is sighted in for the bow speed in use. An adjustment lever having a vertical indentation, disposed in a location easily accessibly to the archer&#39;s index finger of the bow arm while in full draw, is pulled toward the archer until a second sight in position greater than the initial sight in position is indicated on the graduated wheel, typically forty yards although larger alternative distances are acceptable. At the second sight-in yardage, adjustments to the sliding sight arm are made during the sighting in process while the vertical adjustments to the bow sight are avoided. 
   The vertically arced displacement of the sight using the vertical adjustment plate is contingent of the placement of the archery sights about the sliding sight arm. The distance in which the bow sight is seated on the retractable arm allows the sight to have a smaller or larger vertically arced displacement in relation to the archer&#39;s line of sight. It is known by those skilled in the art that adjustments to the angle or trajectory depend on the speed on the bow in use. For instance, a slower bow requires a greater adjustment to the angle of trajectory between target distances, whereas a faster bow requires finer adjustments to the angle of trajectory. With this principle in mind, the current invention incorporates the use of sliding sight arm to vary the path length of a vertically displaced arc using known mathematical principles of trajectory and its relationship to speed. 

   
     DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is an angled perspective view of the calibrated archery bow sight. 
       FIG. 2  is a side view of the calibrated archery bow sight. 
       FIG. 3  is a side view of the calibrated archery bow sight detailing the movements defined in the current disclosure. 
       FIG. 4  is a side view of the calibrated archery bow sight 
       FIG. 5  is a perspective view of the calibrated archery bow sight 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   In the following description, numerous specific details and options of the present invention are set forth in order to provide a more thorough understanding of the claimed invention. It will be appreciated, by one skilled in the art that the Calibrated Archery Bow Sight of the present disclosure may be practiced without such specific details or optional components and that such description are merely for convenience and as such solely selected for the purpose of illustrating the invention. Reference to the figures showing embodiments of the present invention are made to describe the invention and do not limit the scope of the disclosure herein. A calibrated archery bow sight in accordance with the following disclosure is illustrated in the drawings and generally designated  90 . 
   As shown in  FIGS. 4 and 5 , the invention  90  is secured with standard fasteners to an archery bow  80  in the general area of the bow riser. The components of the invention  90  include a mounting bracket  10 , an adjustment lever  20  capable of moving in a curvilinear path, shown in  FIG. 3 , a sliding sight stabilizer rod  30  capable of sliding adjustments, shown in  FIG. 3 , a sliding sight arm  40  capable of sliding adjustments, shown in  FIG. 3 , curved rack gear  50  and pinion  51 , a sight plate  60  capable of rotational adjustment, shown in  FIG. 3 , a sight mount with securing means  64  capable of vertical adjustments, also shown in  FIG. 3  and a calibrated range dial  70  with an index pin  71 . 
   With reference to included FIGUREs, the construction of the invention is comprised of the following. The mounting bracket  10  having a mounting end  11  including a plurality of mounting apertures  12  is affixed to the archery bow  80  using standard fasteners as shown in  FIGS. 4 and 5 . An upper projection  13  of the mounting bracket  10  contains a second pivotal connection  32  with the adjustable sight stabilizer rod  30  disposed in a sliding relation therein. The sight stabilizer bar  30 , having a pivotal end  31  and an unsecured end  33 , is capable of longitudinal sliding adjustments within the second pivotal connection  32  from the pivotal end  31  to the unsecured end  33  and held in the desired location by the second pivotal connection  32 . A sight plate  60 , having an upper end  61  and a lower end  62  is secured to the pivotal end  31  of the sight stabilizer rod  30  by a third pivotal connection  34 . 
   A lower curved projection  14  of the mounting bracket  10  having a trailing end projection tip  15  contains a first pivotal connection  23  rotatably coupling the adjustment lever  20 , having a pivotal end  20  and a translational end  22 , to the lower curved projection  14  at the pivotal end  20 , as shown in  FIGS. 4 and 5 . As shown in  FIG. 5 , a calibrated range dial  70  is disposed between the lower curved projection  14  and the trailing end projection tip  15 . The calibrated range dial  70  is secured with a pinion gear  51  held within a pinion clearance aperture  52  containing a curved rack gear  50  disposed within the adjustment lever  20 , as shown in  FIG. 2 . The rotational motion of the calibrated range dial  70  moving in conjunction with the pinion gear  51  as it rotates about the arc of the curved rack gear  50  in response to translational movement of the adjustment lever  20 . An index pin  71  disposed on the trailing end projection tip  15  indicating the set range of the calibrated range dial  71  by visual inspection of the archer. 
   The translational end  22  of the adjustment lever  20  contains a vertical indentation  24 , as shown in  FIG. 2 , to allow curvilinear movement of the adjustment lever  20  by applying tactile force from within the vertical indentation  24  while in full-draw. A sliding sight arm  40 , having a pivotal angled end  41  and an unsecured end  42  is disposed near the pivotal end  21  of the adjustment lever  20  in sliding relation to a sight arm clamp  44 . The sliding sight arm  40  capable of longitudinal sliding adjustments along its length from the pivotal angled end  41  to the unsecured end  42  within the sight arm clamp  44 . The pivotal angled end  41  is pivotally connected to the sight plate  60  by a fourth pivotal connection  43  at the lower end  62 . The sliding sight arm  40  and the sight stabilizer rod  30  are held parallel to one another with their sliding relationship independent of one another to allow the sight arm plate  60  to be angled as shown in  FIG. 3 . 
   Lateral projections  66  on the sight plate  60  at the upper end  61  and the lower end  63  contain a vertical adjustment means  65  consisting of a threaded screw which is vertically affixed within the lateral projections  66  and held parallel to the vertical sight plate  61 . A sight mount with securing means  64  containing a complimentary helix is disposed on the vertical adjustment means  65  and is capable of vertical movement about the vertical adjustment means  65  as it is turned. A vertical aperture  63  within the sight plate  60  allows the sight mount with securing means  64  to connect a standard sighting means  81  on the side opposite the lateral projections  66  and move the affixed standard sighting means  81  in tandem with the sight mount with securing means  64  along the vertical aperture  63 . 
   As constructed, force applied at the translational end  22  of the adjustment lever  20  will result in respective vertically arced displacement of the sight stabilizer rod  30  at the pivotal end  31  and the sliding sight arm  40  at the pivotal angled end  41  allowing the sight plate  60  and constituent components to move about the vertical arc. In addition the detailed description, it should be appreciated by one skilled in the art that the construction of this invention with respect to the sides on which each component is disposed can be reversed to allow for a left-handed perspective.