Fiber optic pin sight for a bow

Geometrical instruments – Straight-line light ray type – Structurally installed

Reexamination Certificate

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C124S087000, C042S132000

Reexamination Certificate

active

06311405

ABSTRACT:

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable.
BACKGROUND OF THE INVENTION
This invention relates to pin sights for bows, and in particular to a fiber optic pin sight.
Pin sights are often used with bows when hunting. As is known pin sights typically include a plurality of pins that are calibrated for certain distances, for example 15, 30, 50 and 100 yards. These pins are sighted on the target to obtain the proper trajectory for the arrow to be shot. In the past, the pins have typically been made of metal. However, some pin sights now use fiber optic pins. U.S. Pat. No. 5,231,765, for example, discloses such a sight.
Fiber optic pins or pins are generally secured in place in a pin sight using a screw or the like which compresses the fiber optic pin. When a fiber optic pin is compressed at a point, the pin can be damaged and the ability of the fiber optic pin to transmit light can thus be hindered. Obviously, if the pin is damaged and unable to transmit light efficiently, the pin sight will not be operable. On the other hand, if the pin is not securely set in the sight, it can accidentally be moved. The pins are calibrated to correspond to specific distances. If the pin is moved relative to its mount, the fiber optic pin will be out of calibration. This would be true even if the pin's mount did not move. It is therefore desirable to firmly hold the pin in place without unduly compressing the fiber optic pin.
BRIEF SUMMARY OF THE INVENTION
One object of the present invention is to provide a fiber optic pin sight.
Another object is to provide such a pin sight in which the fiber optic pin of the pin sight is securely held in place.
Another object is to provide such a bow sight which will not damage the fiber optic pin.
Another object is to provide such a pin sight in which the fiber optic pin is clamped along a portion of its length, rather than being compressed at a single point, to secure the fiber optic pin in the bow sight.
Another object is to provide such a bow sight in which the pin is easily replaced if necessary.
These and other objects will become apparent to those skilled in the art in light of the following disclosure and accompanying drawings.
In accordance with the invention, generally stated, a fiber optic pin sight is provided which is mountable to a bow. The sight includes a mounting plate which is operatively securable to the bow, a plurality of pin mounting blocks secured to the mounting plate, a fiber optic pin holder secured to each of the pin mounting blocks, and a fiber optic pin extending through and secured in the pin holder. The pin holder includes an externally threaded shaft defining a shaft bore and a compression nut defining a threaded nut bore. The pin extends through the shaft bore. The shaft has a front end and a back end, an outer diameter which is substantially constant along the length of the shaft, and a slot extending forwardly from the back end to define two spaced apart legs. The outer diameter of the shaft is slopingly reduced at the back of the shaft. The slot is sufficiently long so that said legs are slightly flexible, and can grip the pin. The nut bore has a tapered section which reduces the diameter of the nut bore from a diameter that the shaft can be threaded through to a smaller diameter. As the shaft is threaded into the nut, and as the slit portion of the shaft is introduced into the tapered section of the nut bore, the nut brings the shaft legs together such that the legs grip the said fiber optic pin. Preferable, the nut bore has three sections: a threaded section of constant diameter, the tapered section, and a third section which receives the nose of the shaft. The third section has a diameter slightly larger than the end of the shaft nose and smaller than the diameter of the main part or body of the shaft.
The shaft is preferably made of brass. To enable the legs to be sufficiently flexible, the slot a length approximately 1.6-1.8 times the outer diameter of the shaft. The nut bore preferably does not extend all the way through the nut. The sight preferably includes a generally U-shaped guard which surrounds the fiber optic pins.
In another embodiment, the shaft has an outwardly expanding or sloped back end, rather than an inwardly sloped back end. The nut bore is of generally constant diameter, and when it is threaded over the expanded back end of the shaft, the legs at the back end of the shaft are brought together to tightly grip the fiber optic pin.


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