Adjustable yardage plate

Details Adjustable yardage plate Adjustable yardage plate

1994-05-04

1995-11-14

Wirthlin, Alvin

Geometrical instruments

Straight-line light ray type

Structurally installed

F41G 1467

Patent

active

054654912

ABSTRACT:
A sighting apparatus for a bow is fixedly mounted on a bow and is provided with a lever such that a sight unit is tilted as the sighting device is adjusted for longer distances so as to compensate for gravity effect on arrows. The sighting apparatus comprises a gauge which is adjustably mounted to the sighting apparatus and may be locked into an adjusted position corresponding to an arrow having alternate flight characteristics from an arrow used to calibrate the apparatus.

REFERENCES:
patent: 3450122 (1969-06-01), Diamond
patent: 3505985 (1970-04-01), Helton
patent: 3568323 (1971-03-01), Lendway
patent: 4020560 (1977-05-01), Heck
patent: 4136461 (1979-01-01), Gasser
patent: 4541179 (1985-09-01), Closson
patent: 5092052 (1992-03-01), Godsey
Pages of product catalog of Koeppler (No Page #, No Date).

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