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Publication numberUS3492733 A
Publication typeGrant
Publication dateFeb 3, 1970
Filing dateApr 23, 1968
Priority dateApr 23, 1968
Publication numberUS 3492733 A, US 3492733A, US-A-3492733, US3492733 A, US3492733A
InventorsLeatherwood James M
Original AssigneeLeatherwood James M
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Variable power sighting scope
US 3492733 A
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Description  (OCR text may contain errors)

1970 J. M. LEATHERWOOD VARIABLE POWER SIGHTING SCOPE Filed April 23, 1968 mluJ 24 500 OM RWN 0N ud hul WIN Nahum- 00 JAMES M. LET'HEHWQQZD INVENTOR.

TTORNE'Y United States Patent 3,492,733 VARIABLE POWER SIGHTING SCOPE James M. Leatherwood, Rte. 1, Box 120, Stephenville, Tex. 76401 Filed Apr. 23, 1968, Ser. No. 723,523 Int. Cl. F41g 1/38 US. CI. 33-50 1 Claim ABSTRACT OF THE DISCLOSURE A variable power sight pivotally mounted for movement in a vertical plane on a gun barrel and including a trajectory adjustment. The variable power sight referred to is conventional and includes a front focus, a rear focus and an external ring for varying the magnifying power of the sight. The trajectory adjustment of the present invention is generally comprised of a fixed target framing reference of a preselected height in the rear focus and a cam rotatable with the external ring, the rise of the cam making contact with a stationary portion of the gun.

This invention relates to telescopic sights for guns in which the adjustment of the telescope to the range automatically raises or lowers the trajectory of the bullet according to the distance of the target, and which is an improvement on my Patent No. 3,340,614 in which the desired result is achieved by adjusting a pair of cross hairs to include an object of known height, during which process a cam changes the alignment of the scope with the gun barrel, raising or lowering the same so that the allowance for distance is automatically made when the scope is sighted directly on the target.

There is now in common use a telescopic sight including a variable power or zoom element whereby the apparent size of the target image in the scope can be changed by turning an external ring which is connected by an internal linkage to the lenses making up the zoom system. By comparing an object of known height to the space between two permanent cross hairs on the upper portion of the reticle an estimate of the range can be made, but an allowance for the trajectory of the bullet still has to be made according to this estimate and there is possibility of considerable error.

One object of this invention is to provide an automatic coupling between the external ring operating the zoom system in the telescope and the body of the gun so that the line of sight and the barrel of the gun are exactly or nearly exactly related to provide the proper trajectory when the distance of the target has been determined.

Another object of the invention is to provide an adjustable connection between the telescope and the gun which is rugged, reliable and trouble free.

Another object of the invention is to provide means whereby the sight adjusting element can be easily altered to match the type of ammunition being used.

A still further object of the invention is to provide a sight adjusting arrangement which can be simply and economically adapted to zoom type telescopes presently 1n use.

These and other objects will become apparent from the following description and the accompanying drawing, in which:

FIGURE 1 is a side elevational view of a variable power or zoom type telescope and its attachment to a gun according to this invention.

FIGURE 2 is a cross sectional view taken along line 22 in FIGURE 1.

FIGURE 3 is a diagram of the optical system of the scope used in the invention.

3,492,733 Patented Feb. 3, 1970 FIGURE 4 is a diagram of a target seen through the scope when the latter is not adjusted to the range.

FIGURE 5 is a diagram of the target seen through the scope when the latter is adjusted to the range, and

FIGURE 6 is a diagram of the target seen through the scope after the range has been determined and the gun has been aimed ready for firing.

As illustrated in FIGURE 1, the type of telescopic sight herein considered, and designated generally by the number 10, includes an eyepiece 11, an objective 12 and a barrel 13 containing the erecting and magnifying lenses assembled in a zoom system, which are not illustrated except diagrammatically in FIGURE 3.

An adjusting ring 14, operates (by means of internal linkage not shown) the zoom element of the scope so that the image of the target can be made to look larger or smaller in proportion to the field, as well known in the art. A handle 15 on the adjusting ring 14 facilitates its adjustment. The scope 10 is mounted securely on the gun by means of a bracket 17 and screws '18. A rear clamp 19 is integral with the bracket 17 and a forward clamp 20 is connected to the bracket by means of a substantial and relatively tight pivot 21. A stationary stud 22 extends upwardly from the gun 16 toward the adjusting ring 14- and is surrounded by a ring 23 integral with the rearward end of the bracket 17. The bracket 17 is thinned just behind its attachment to the gun 16 to provide a spring portion 24 which is stressed to hold the rearward end of the sc0pe 10 tightly against the stud 22.

A cam 25, sized at the inside to fit the adjusting ring 14, is held rigidly to the latter by means of a machine screw 26. The outer surface 27 of the cam 25 is shaped to align the scope -10 with the gun 16 in a manner hereinafter described.

Referring now to FIGURE 3, a standard sighting telescope has within it two points of focus at which the reticle holding the cross hairs can be located. In a nonzoom type scope the reticle is located at the front focus and thus the cross hairs remain clear to the observer even though the field focus is changed by moving the ocular lens. In the zoom type telescope the field is in permanent focus and because of the optical characteristics of the scope it is necessary to place the reticle at the point of rear focus. In the scope used with this invention the reticle is provided with two upper horizontal cross hairs 28 and 29 spaced apart a mathematically determined distance, and with the usual aiming cross hairs 30 and 31 to indicate the exact center of the field. This pattern of cross hairs remains the same throughout the operation of the scope.

The upper cross hairs 28 and 29 are spaced to bracket a target 32 of a known dimension, for example, 18 inches high, at a known distance, such as 200 yards. If the target appears in the scope as shown in FIGURE 4, the scope is set for too great a distance and the adjusting ring 14 is in the position indicated by the dotted handle outline 15a in FIGURE 2. This would raise the rear end of the scope 10 in relation to the gun 16 and cause the pro jectile to overshoot the target. If the adjusting ring 14 is turned to where the handle is in the position 15b in FIG- URE 2, the pattern will appear as shown in FIGURE 5. The target fits between the cross hairs 28 and 29' and the scope is adjusted to the targets true distance. The cam 25 is turned to where its thin portion rests on the stud 22, lowering the rear end of the scope to where the gun will be aimed on target when it is sighted as in FIGURE 6. When the adjusting ring 14- and the cam 25 are in the position shown by solid lines in FIGURE 2 the target will appear approximately as shown by the dotted outline 32a in FIGURE 5.

As an example of how to use the scope in hunting deer, for instance, if the head and chest of the deer are sighted 0n the cross hairs 28 and 29 and the adjusting ring 14 turned until that part of the deer, which measures approximately 18 inches, falls exactly between the cross hairs, the gun can then be aimed directly on the target and the trajectory will have been automatically adjusted to the distance.

If the hunter chooses to switch to a difierent type of ammunition for some reason, a new cam 25 shaped to match the velocity and weight of the new projectile, can be placed on the adjusting ring -14 in a few minutes, and no other adjustment is necessary and no mental calculations are required to compensate for the new type of ammunition.

What is claimed is:

1. In a variable power type telescopic gun sight longitudinally and pivotally mounted on a gun barrel and having an external zoom adjusting ring rotatable about the References Cited UNITED STATES PATENTS 3,340,614 9/1967 Leatherwood 3350 SAMUEL S. MATTHEWS, Primary Examiner

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3340614 *Oct 19, 1964Sep 12, 1967Leatherwood James MAdjustment means for gun sighting scope
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3782822 *Nov 8, 1971Jan 1, 1974M SpenceMethod and apparatus for automatic ranging with variable power telescopic gun sight
US4393595 *Jul 20, 1981Jul 19, 1983Leupold & Stevens, Inc.Tube adjustment gasket and rifle scope employing same
US4497548 *Dec 13, 1982Feb 5, 1985Burris CompanyVariable-power riflescope with range-compensating reticle and a field stop diaphram centered off the optical axis
US4660289 *Jun 13, 1986Apr 28, 1987Wilhide Robert AAdjustable bow sight mount
US4789231 *Dec 29, 1987Dec 6, 1988Kabushiki Kaisha Light Kohki SeisakushoArrangement for correcting ballistic trajectory in riflescope
US5181323 *Oct 31, 1991Jan 26, 1993Gary CooperHunting scope for determining accurate trajectory of a weapon
US5365670 *Feb 25, 1994Nov 22, 1994Klimochko Vernon WHunting scope enhanced magnification lens accessory
US5521757 *Mar 26, 1993May 28, 1996Olson; KevinAdjustment lever for attachment to a scope adjustment ring
US5528847 *Aug 10, 1994Jun 25, 1996Fisher; Timothy D.Variable power telescopic sight
US5920995 *Dec 8, 1997Jul 13, 1999Sammut; Dennis J.Gunsight and reticle therefor
US6032374 *Aug 5, 1998Mar 7, 2000Sammut; Dennis J.Gunsight and reticle therefor
US6357158Sep 14, 1998Mar 19, 2002Smith, Iii Thomas D.Reticle-equipped telescopic gunsight and aiming system
US6453595Mar 6, 2000Sep 24, 2002Horus Vision, LlcGunsight and reticle therefor
US6516699Jun 14, 2001Feb 11, 2003Horus Vision, LlcApparatus and method for calculating aiming point information for rifle scopes
US6681512Mar 6, 2002Jan 27, 2004Horus Vision, LlcGunsight and reticle therefor
US7603804Sep 3, 2004Oct 20, 2009Leupold & Stevens, Inc.Ballistic reticle for projectile weapon aiming systems and method of aiming
US7705975Aug 14, 2006Apr 27, 2010Michael Christopher FarrisReticle
US7738082Oct 22, 2007Jun 15, 2010Leupold & Stevens, Inc.System and method for measuring a size of a distant object
US7832137Dec 28, 2006Nov 16, 2010Horus Vision, LlcApparatus and method for calculating aiming point information
US7856750Nov 12, 2003Dec 28, 2010Horus Vision LlcApparatus and method for calculating aiming point information
US7937878Mar 27, 2006May 10, 2011Horus Vision LlcApparatus and method for calculating aiming point information
US7963206Feb 15, 2006Jun 21, 2011David Eric BartleApparatus for sighting-in a gun
US8049959Aug 17, 2010Nov 1, 2011Leupold & Stevens, Inc.Scope with improved magnification system
US8109029May 4, 2004Feb 7, 2012Horus Vision, LlcApparatus and method for calculating aiming point information
US8172139Nov 22, 2010May 8, 2012Bitterroot Advance Ballistics Research, LLCBallistic ranging methods and systems for inclined shooting
US8230635 *Dec 27, 2010Jul 31, 2012Horus Vision LlcApparatus and method for calculating aiming point information
US8286384Jun 27, 2008Oct 16, 2012Leupold & Stevens, Inc.Ballistic range compensation for projectile weapon aiming based on ammunition classification
US8353454May 14, 2010Jan 15, 2013Horus Vision, LlcApparatus and method for calculating aiming point information
US8437079 *May 6, 2011May 7, 2013Leapers, Inc.Apparatus including a reticle, assembly and method for operating the same
US8516735Jan 16, 2012Aug 27, 2013Anthony IlacquaAdjustment mechanism for firearm scope zoom
US8656630 *Jun 9, 2011Feb 25, 2014Horus Vision LlcApparatus and method for aiming point calculation
US8701330Jan 2, 2012Apr 22, 2014G. David TubbBallistic effect compensating reticle and aim compensation method
US8705173 *Jan 4, 2012Apr 22, 2014Leupold & Stevens, Inc.Optical rangefinder and reticle system for variable optical power sighting devices
US8707608 *Jul 30, 2012Apr 29, 2014Horus Vision LlcApparatus and method for calculating aiming point information
US20120137567 *Jun 9, 2011Jun 7, 2012Horus Vision LlcApparatus and method for aiming point calculation
US20120281278 *May 6, 2011Nov 8, 2012Leapers, Inc.Apparatus Including a Reticle, Assembly and Method for Operating the Same
US20130170027 *Jan 4, 2012Jul 4, 2013Victoria J. PetersOptical rangefinder and reticle system for variable optical power sighting devices
DE3145035A1 *Nov 12, 1981Jun 24, 1982Daniel Richard Shepherd"zielfernrohr"
EP0234180A1 *Dec 18, 1986Sep 2, 1987Walter BastaTelescopic sight with automatic elevation adjustment by means of an electric motor
WO1999030101A1Sep 28, 1998Jun 17, 1999Dennis J SammutImproved gunsight and reticle therefor
WO2005047805A2Nov 12, 2004May 26, 2005Horus Vision LlcApparatus and method for calculating aiming point information
Classifications
U.S. Classification42/122, 359/422, 359/428, D16/132
International ClassificationF41G1/38, G02B23/14, F41G1/00
Cooperative ClassificationG02B23/14, F41G1/38
European ClassificationF41G1/38, G02B23/14
Legal Events
DateCodeEventDescription
Mar 8, 1984AS06Security interest
Owner name: FARMERS-FIRST NATIONAL BANK/ AN INTERFIRST BANK OF
Effective date: 19831220
Owner name: LEATHERWOOD, JAMES M.
Mar 8, 1984ASAssignment
Owner name: FARMERS-FIRST NATIONAL BANK/ AN INTERFIRST BANK OF
Free format text: SECURITY INTEREST;ASSIGNOR:LEATHERWOOD, JAMES M.;REEL/FRAME:004231/0178
Effective date: 19831220
Sep 15, 1980AS06Security interest
Owner name: FARMERS-FIRST NATIONAL BANK/MALL BUSINESS ADMINIST
Owner name: LEATHERWOOD .J.M.
Effective date: 19800909