Riflescope with recessed bottom surface for reduced mounting height
A riflescope includes an objective optic assembly with a bottom surface that defines a scoop. Upon mounting the riflescope, the scoop receives a portion of a firearm. The scoop eliminates interference between the objective optic assembly and the firearm and allows a centerline of the riflescope to be placed in closer proximity to a centerline of the firearm.
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This application is a continuation of U.S. application Ser. No. 11/060,444 filed Feb. 16, 2005.
BACKGROUNDRiflescopes typically include an elongate housing comprising a substantially cylindrical main tube, with outwardly flared ends. Referring to
Mounting a riflescope 10 lower on firearm 24 places a centerline 26 of riflescope 10 closer to a centerline 28 of firearm 24. The increased centerline proximity improves operation of firearm 24, as a user is able to keep the user's cheek on the rifle stock while having the user's eye as close as possible to the top of the firearm barrel. The present inventors have recognized that increased contact between cheek and stock (i.e. “cheek weld”) allows for an improved static position to increase accuracy. If a user needs to raise his or her eye to view the eyepiece, cheek contact with the stock may be lost, which increases inaccuracy.
As shown in
A prior art riflescope sold by the Redfield Optics division of Meade Instruments Corporation under the name WIDEFIELD uses an oval-shaped objective optic design to gain a wider field of view.
U.S. Pat. No. 4,940,324 discloses an electronic sight with lenses that have a horizontal field of view greater than a vertical field of view. The lenses do not provide added magnification and do not reduce interference between the riflescope and the firearm.
The present inventors have recognized a need for an improved projectile weapon aiming system for increasing centerline proximity between riflescope and firearm.
SUMMARYIn accordance with preferred embodiments, a riflescope includes a tubular housing with an eyepiece assembly coupled to one end of the housing. An opposing end of the housing is coupled to an objective optic assembly. The objective optic assembly may be nearly circular in cross-section except for a scoop that is formed on its bottom surface. The objective optic assembly includes an objective housing and an objective optic supported within the objective housing. The objective housing and objective optic include scooped bottom surfaces.
Upon mounting the riflescope to a firearm, the scoop provides clearance for a portion of the firearm which may nest in the scoop. In this manner, the longitudinal centerline of the riflescope can be placed lower, i.e., in closer proximity to the firearm. This lower mounting position may improve the user's ability to form a good cheek weld against the rifle stock, to thereby increase stability when aiming. This is in contrast with conventional large-objective scopes wherein the scope is mounted higher on the rifle and the user's head may need to be held above the stock in order to view a target through the riflescope. Aiming precision may also be improved with riflescopes in accordance with the disclosed embodiments, as the aiming axis (e.g. longitudinal centerline) of the riflescope is closer to the firearm and can therefore be more closely aligned with the bore of the firearm barrel. A viewed image remains substantially circular, and the removed optic material created by the scoop does not perceptually impair visibility.
Additional aspects and advantages of this invention will be apparent from the following detailed description of preferred embodiments, which proceeds with reference to the accompanying drawings.
Throughout the specification, reference to “one embodiment,” “an embodiment,” or “some embodiments” means that a particular described feature, structure, or characteristic is included in at least one embodiment. Thus appearances of the phrases “in one embodiment,” “in an embodiment,” or “in some embodiments” in various places throughout this specification are not necessarily all referring to the same embodiment.
Furthermore, the described features, structures, characteristics, and methods may be combined in any suitable manner in one or more embodiments. Those skilled in the art will recognize that the various embodiments can be practiced without one or more of the specific details or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or not described in detail to avoid obscuring aspects of the embodiments.
Referring to
Referring to
Objective optic assembly 106 includes an objective optic 122 and an objective housing 124 that are both designed in accordance with the shape of scoop 120. Objective optic 122 includes two opposing faces and a periphery with a bottom surface 126 that defines a scoop 128. A larger-sized objective optic 122 may be used to increase light gathering while reducing the distance between a riflescope centerline 130 and a firearm centerline 132. Scoop 120 may have alternative cross-sectional shapes to accommodate various firearm shapes or based on design constraints. Objective optic 122 may include glass that is ground into the desired shape. Alternatively, objective optic 122 may include plastic that is molded into the desired shape.
Objective housing 124 may begin as a cylindrical workpiece that is formed on a lathe. The workpiece may then be pressed or fitted into a conforming shape by hydro-forming or impact forming techniques. Objective housing 124 may also be formed by machining material to the desired dimensions. The completed objective housing 124 includes a scoop section 134 shaped to support objective optic 122 along scoop 128. Objective housing 124 may be coupled to tubular housing 104 or may be integrally formed of unitary construction with tubular housing 104.
Referring to
Referring to
Objective optic assembly 106 includes a detachable front end member 152 that is shaped to define scoop 120 and to support objective optic 122. In manufacturing, objective optic 122 is positioned and supported within objective housing 124. Front end member 152 then couples to objective housing 124 and retains the periphery of objective optic 122 between front end member 152 and objective housing 124. Coupling front end member 152 to objective housing 124 may be achieved by press fitting or by application of adhesives. Upon coupling front end member 152, a hermetic seal is created to retain an inert gas within the interior of the riflescope. Gaskets, elastomers, or adhesives may be disposed between the periphery of objective optic 122 and front end member 152 and/or objective housing 124 to ensure the seal.
In more sophisticated riflescopes, objective optic assembly 106 may include one or more additional objective optics 154, 156 as shown in
Referring to
Riflescope 100 retains a traditional look and functionality except for the appearance of scoop 120. Scoop 120 removes a small amount of objective optic 122, but there is no perceivable visual effect when viewing through riflescope 100. Thus an image produced by riflescope 100 appears substantially circular. Furthermore, as scoop 120 is only a small area of the added circumference of objective optic 122, riflescope 100 benefits from a large objective optic 122 with good light-gathering ability.
The result is that the light-gathering benefit of a large objective optic 122 is now mountable at a height that was previously available only with smaller objective optics. Riflescope 100 may be placed at a height that is easier to use in the field, with centerline 130 of riflescope 100 closer to firearm centerline 132. This can allow a user to keep his or her cheek on the stock of firearm 102 while sighting a target through riflescope 100 and thereby create a secure check weld. An improved check weld provides superior stability and improved aiming accuracy. Aiming precision may also be improved as the distance between centerlines 130, 132 is reduced, because the aiming axis of the riflescope can thereby be more closely aligned with the bore of the firearm barrel when the riflescope is sighted in.
By incorporating a preferred design described herein, it is anticipated that a riflescope with a 56-mm objective optic could be mounted like a conventional riflescope with a 40-mm objective optic. Similarly, a 50-mm riflescope could be mounted like a conventional 36-mm riflescope, and a 40-mm riflescope could be mounted like a conventional 28-mm riflescope.
Those skilled in the art will appreciate that the overall shape of riflescope 100 and the shape of scoop 120 are matters of design choice and may be different from the shape and positioning shown herein. However, the riflescope described herein is not limited to use with rifles, but may also be used in various other types of sighting devices and projectile weapon aiming devices and may be used to aim one or more of a variety of projectile weapons, such as pistols and others. Thus it will be obvious to those having skill in the art that many changes may be made to the details of the above-described embodiments without departing from the underlying principles of the invention. The scope of the present invention should, therefore, be determined only by the following claims.
Claims
1-27. (canceled)
28-31. (canceled)
32. A riflescope adapted to be mounted on a firearm, the riflescope comprising a tubular housing supporting on opposite ends an objective optic assembly and an eyepiece optic assembly, wherein the objective optic assembly includes a bottom recess adapted to permit the firearm to at least partially nest within the bottom recess.
33. A riflescope according to claim 32 wherein a centerline of the riflescope is enabled to be mounted is closer proximity to the firearm than possible without the bottom recess.
34. A riflescope according to claim 33 wherein a 56-mm objective optic assembly having a bottom recess may be mounted on a firearm at a centerline height corresponding to a centerline height of a conventional 40-mm object optic assembly without a bottom recess.
35. A riflescope according to claim 32 wherein the riflescope is mounted on the firearm with a gap between the firearm and objective optic assembly.
36. A riflescope according to claim 32 wherein the objective optic assembly comprises a lens assembly selected from the group consisting of: a singlet lens, a doublet lens.
37. A riflescope according to claim 32 wherein the bottom recess is formed in a concave shape.
38. A riflescope according to claim 37 wherein the tubular housing is formed with a concave recess corresponding to the bottom recess of the objective optic assembly.
39. A riflescope according to claim 32 wherein the bottom recess is formed in a shape selected from the group consisting of: triangular, rectangular, trapezoidal, or arcuate.
40. A riflescope according to claim 32 wherein an image produced by the riflescope is substantially circular.
41. A riflescope according to claim 32 wherein the objective optic assembly includes
- at least one lens,
- an objective housing supporting the lens,
- a detachable front end member coupled to the objective housing forming a hermetic seal therebetween.
42. A method of making a riflescope having a larger-diameter objective optic with reduced distance between a centerline of the riflescope and a centerline of a firearm, comprising the steps of
- forming the objective optic assembly with a bottom recess;
- positioning the riflescope onto the firearm such that the firearm partially nests into the bottom recess.
43. A method according to claim 42 wherein the step of forming the objective optic assembly with a bottom recess comprises
- forming an objective optic of the objective optic assembly out of glass and grinding the glass objective optic into a desired shape for the bottom recess.
44. A method according to claim 42 wherein the step of forming the objective optic with a bottom recess comprises
- forming the objective optic out of plastic that is molded into a desired shape for the bottom recess.
45. A method according to claim 42 wherein the step of forming the objective optic with a bottom recess comprises
- forming the objective optic as a doublet lens and forming the bottom recess in both lenses of the doublet lens.
46. A method according to claim 42 further comprising forming an objective housing with a concave bottom portion corresponding to the bottom recess of the objective optic.
47. A method according to claim 46 further comprising forming the objective housing by machining material into a desired shape.
48. A method according to claim 46 further comprising forming the objective housing from a cylindrical workpiece pressed or fitted into a conforming shape.
Type: Application
Filed: May 30, 2007
Publication Date: Jun 5, 2008
Applicant: Leupold & Stevens, Inc. (Beaverton, OR)
Inventor: Andrew W. York (Portland, OR)
Application Number: 11/809,199