Optical sighting devices

• US 4,263,719 A
• Filed: 08/15/1977
• Issued: 04/28/1981
• Est. Priority Date: 08/16/1976
• Status: Expired due to Term

• Current Assignee: Colin A. Murdoch
• Original Assignee: Colin A. Murdoch
• Inventors: Murdoch, Colin A.
• Primary Examiner(s): Martin, Jr., William D.
• Application Number:
  US05/824,960
• Time in Patent Office: 1,352 Days
• Field of Search: 33/276, 33/277, 33/278, 33/245, 33/297, 33/298, 33/246, 33/265, 350/10, 356/247
• US Class Current: 33/297
• CPC Class Codes: F41G 1/12 with line or mark other than notch
• CPC Class Codes: F41G 1/473 for lead-indicating or range-finding, e.g. for use with rifles or shotguns
• CPC Class Codes: G02B 23/10 reflecting into the field of view additional indications, e.g. from collimator
• CPC Class Codes: G02B 27/32 Fiducial marks and measuring scales within the optical system

Abstract

An optical device for use as a gunsight, telescope or viewfinder is disclosed, the device being capable of indicating the distance of the target from the user. This is accomplished by a reticle in, or associated with, the sighting device, the reticle being calibrated to give the viewer an instant indication of range without requiring mechanical adjustments.

Claims

1. In a reticule for use with a weapon and having means thereon for estimating the distance between said weapon and a target having an estimable dimension in a generally horizontal plane, said reticule including a generally vertical sighting line and a generally horizontal base sighting line, the improvements comprising a plurality of vertically displaced segmented horizontal lines intersecting the vertical sighting line, the vertical spacing between the segmented horizontal lines defining a constant range increment such that the intersection of each of the segmented horizontal lines with the vertical sighting line indicates the point of impact on the target of a projectile fired from said weapon at that range from the target, wherein end points of said segmented horizontal lines lie on hyperbolic curves disposed on either side of said vertical sighting line, the lengths of each of the corresponding segments and the widths of each of the corresponding spaces between segments of successive segmented lines respectively corresponding to the estimable dimension of a particular target at that range increment.

2. The improved reticule of claim 1, wherein each of said segmented lines are centered on said vertical sighting line.

3. The improved reticule of claim 1, wherein each of segmented lines comprises a pair of visible horizontal lines horizontally spaced from said vertical sighting line.

4. The improved reticule of claim 3 wherein each of said pair of visible horizontal lines are portions of a segmented horizontal line centered on said vertical sighting line.