US2526816A - Detachable telescope sight mount for firearms - Google Patents

Description

SEC

Oct. 24, 1950 R. R. HARDGROVE DETACHABLE TELESCOPE SIGHT MOUNT FOR FIREARMS Filed June 13. 1949 Attorney Patented Oct. 24, 195

UNITED STATES PATENT OFFICE DETACHABLE TELESCOPE SIGHT MOUNT FOR FIREARMS Robert R. Hardgrove, Livingston, Mont., assignor of one-half to Ernest T. Lake, Livingston, Mont.

1 Claim. 1

This-invention relates to an improved mounting for detachably and accurately positioning a telescope sight on a firearm such as a rifle and has for its primary object to provide a sight mount which may be quickly and easily applied to rifles without requiring the use of special tools other than a tool for drilling and tapping holes or recesses in the receivers of certain firearms.

More particularly, it is an aim of the present invention to provide a telescope sight mount including adapters milled to fit receivers of different firearms and having a multi-sided upper surface providing a seat for the base portion of a standard mounting bracket, constituting a part of the sight mount and which will afford the maximum stability for the mounting bracket to maintain said bracket properly seated on the adapter when'the telescope sight is detachably clamped to the firearm.

Still another object of the invention is to provide a mount wherein pressure of the recoil of the firearm is against a stationary retaining element of the mount rather than against a resiliently supported retaining element.

Various other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawing, illustrating a presently preferred embodiment thereof, and wherein:

Figure 1 is a side elevational view, partly in vertical section, showing a portion of a rifle with a telescope sight detachably mounted thereon by the side mount;

Figure 2 is a top plan view of the receiver portion of the rifle showing the telescopesight removed therefrom;

Figures 3 and 4 are cross sectional views taken substantially along planes as indicated by the lines 3-3 and 4-4, respectively, of Figure 1, Figure 3 being on an enlarged scale, and

Figure 5 is a longitudinal sectional view taken substantially along a plane as indicated by the line 55 of Figure 2 and showing the sight applied.

Referring more specifically to the drawing, for the purpose of illustrating a preferred application and use of the detachable telescope sight mount, designated generally 6 and comprising the invention, the receiver portion, designated 1 of a conventional rifle and a conventional telescopic sight, designated generally 8, have been illustrated in the drawing to illustrate the application and use of the sight mount 6.

The sight mount 8 includes a front adapter, designated generally 9 and a rear adapter, desig-.

nated generally l0. As best illustrated in Figure 3, the front adapter 9 is provided with a concave cross sectional bottom surface II which is adapted to fit flush on the upper surface of the receiver 1 forwardly of the ejector opening [2 of said receiver. Said under surface ll may vary in shape to adapt it to fit flush against the upper surface of receivers of different shapes. The upper surface of the front adapter 9 includes a substantially flat longitudinally extending central portion l3 and upwardly converging side portions M which merge with the side edges of the central portion l3 to form a three sided top surface preferably corresponding to three sides of an octagon; The inner or rear end of the adapter 9 is provided with a rearwardly opening notch I5 which tapers toward its forward or closed end and which preferably has a rounded upper surface, as clearly illustrated in Figure 3. The adapter 9 is provided with longitudinally spaced openings IS in the top surface thereof, as seen in Figure 5, to receive screws I! which are countersunk therein and which detachably engage in threaded recesses l8 of the receiver 1 for detachably mounting the adapter 9 thereon.

The adapter I0 is provided with an under surface H! which is concave in cross section to engage flush on another portion of the receiver 1 and is provided at one side thereof with a longitudinally extending depending lip 20 and at its opposite side with a longitudinally extending depending flange 2l, which lip and flange engage opposite sides of the receiver 1. The flange 2| is provided with openings for receiving screw fastenings 22 which engage threaded recesses in a side of the receiver 1, one of which is indicated in dotted lines at 23 in Figure 4. The adapter [0 likewise is provided with a three sided upper surface including a substantially flat horizontally disposed intermediate top portion 24 and upwardly converging side surfaces 25 which likewise extend longitudinally of the adapter l0 and the upper edges of which merge with the side eges of the top surface 24.

It will be understood that the side portions and bottom surfaces of the adapters 9 and It may vary to accommodate-them to receiver surfaces of different shapes and that the location of the fastening receiving opening may likewise be varied and, in many cases, may be located to receive fastenings for engagement with tapped recesses or openings already provided in the firearm receiver so that it will not be necessary to tap the openings 18 and 23 to receive the fastenings l1 and 22.

The telescope sight mounting 6 also includes a front mounting bracket, designated generally 26 and a rear mounting bracket, designated generally 21. The mounting brackets 26 and 21 are provided with corresponding bores 28 extending therethrough for detachably receiving the barrel of the telescope sight 8 and said brackets have split upper portions 29 which are connected by screws 30 which slidably engage in bore portions 3| thereof and threadedly engage other aligned bore portions 32 so that the screws 30- may be tightened for clamping the sight barrel in the bores 28 and with the depending portions of said brackets 26 and 21 in alignment, for a purpose which will hereinafter become apparent. The depending, leg portion 33 of the front mounting bracket 26 is provided with a three sided bottom surface 34 which is shaped to seat flush on the top surface portions I3 and 14 of the adapter 9, as clearly illustrated in Figure 3. Said leg 33 is provided with an integral rearwardly projecting hook shank 35 which terminates at its rear, free end in a depending, forwardly extending hook 36 having a downwardly and forwardly inclined upper surface which is adapted to seat in the rearwardly opening notch I when the bottom supporting bracket surface 34 is seated on the upper adapter surface l3, 14.

The mounting bracket 21 is likewise provided with a depending portion or leg 31 having a recessed three sided bottom surface or foot portion 3 8 which is shaped to seat flush on the upper surface 24, 25 of the rear adapter [0, as clearly illustrated in Figure 4. Said rear adapter [0 is provided at its forward end with a forwardly opening, rearwardly tapering notch 39 having a rounded upper surface, as seen in Figure 4.

A collar 46 is disposed on the barrel of the sight 8, between the mounting brackets 26 and 21 and adjacent said forward mounting bracket 26 and is held against forward movement toward the mounting bracket 26 by a stop 4|, which is disposed on the barrel between the collar 40 and bracket 26. An elongated sleeve 42 has its forward end slidably engaging on the collar 40 and is provided with an internal annular flange 43 at its rear end for slidably engaging the barrel of the sight 8 and the inner surface of which forms a seat for one end of an expansion coil spring 44 which is disposed within the sleeve 42 and around the sight barrel and which has its opposite end seated against the rear end of the collar 46 for urging the sleeve 42 rearwardly or toward the mounting bracket 21. The sleeve 42 is provided with anintegral hook 45 which projects laterally therefrom, adjacent its rear end and which is normally disposed in a depending position and which has a rearwardly extending bill 46 provided with a downwardly and rearwardly inclined upper surface shaped to seat snugly in the recess 39.

From the foregoing it will be readily apparent that the sight 8 when positioned as seen in Figure 1 may be readily demounted from the firearm receiver 1 by manually grasping the externally roughened surface 41 of the sleeve 42 for forcing said sleeve forwardly or toward the front mounting bracket 26 against the action of its spring 44 to disengage the hook 45 from the recess 39 so that the telescope sight 8 can then be swung upwardly 0n the bracket 26 as a pivot for disengaging the hook 36 from the recess 15 to thereby quickly and easily demount the sight from the receiver.

sight can be quickly and easily mounted on the receiver by positioning the forward edge of the bottom surface 34 of the bracket 26 in engagement with the top surface of the adapter 9 and then rocking the rear end of the sight downwardly until a portion of the hook 36 engages the notch 15. By then exerting a forward pressure on the sleeve 42, said sleeve can be displaced forwardly of the sight 8 so that its hook 45 will clear the forward end of the adapter In to permit the bottom surface 38 of the mounting bracket 21 to be moved downwardly into engagement with the surface portions 24 and 25 of the adapter I0 after which pressure on the sleeve is released to permit the spring 44 to displace the sleeve and hook 45 rearwardly for engaging the hook in the notch 39 and to also fully seat the hook 36 in the notch IS. The pressure of the spring 44 will tend to displace the hooks into the notches and the upper inclined surfaces of said hooks by engagement with the inclined upper surfaces of the notches will cam the mounting brackets 26 and 21 downwardly and into flush seating engagement with the top surfaces of the adapters 9 and [D so that the sight 8 will be correctly positioned above and in alignment with the firearm barrel and the engagement of the foot portions 34 and 38 of the mounting brackets 26 and 21, respectively, with the front and rear adapters 9 and 10, respectively, will prevent any lateral displacement of the sight 8, when in an applied position, to insure a proper mounting of the sight.

Furthermore, it will be noted that the spring 44 exerts a rearward force against the movable hook 45 so that the recoil of the firearm will be against the stationary hook 36 so as not to cause any vibration of the sight relatively to the fire-- arm,

From the foregoing it will be readily apparent that the sight mount 6 may be readily applied to firearm receivers, sometimes without even the necessity of drilling holes for the screw fastenings l1 and 22 and on other occasions merely by drilling and tapping such recesses or openings. As the notches l5 and 39 are already formed in the adapters 9 and 16 no milling operation is required thereby making it a relatively simple operation for any gunsmith to apply the sight mount to a firearm.

As previously stated, the shape of the under sides of the adapters 9 and in may vary to accommodate them to receiver surfaces of different shapes and the location of the fastening receiving openings thereof may likewise be varied to accommodate them to tapped recesses or bores where already provided.

Various other modifications and changes are contemplated and may obviously be resorted to, without departing from the spirit or scope of the invention as hereinafter defined by the appended claim.

I claim as my invention:

A detachable telescope sight mount for firearms comprising a pair of adapters adapted to be detachably fastened to the upper surface of the receiver of a firearm in longitudinally spaced relationship, said adapters each having a multisided upper surface disposed longitudinally of the firearm, a pair of mounting brackets adapted to be detachably clamped to the barrel of a telescope sight in longitudinally spaced relationship and supported on the adapters, said mounting brackets having aligned depending legs each provided with a recessed, multi-sided bottom surface It will likewise be readily apparent a 7 shaped to seat flush on the upper surface of one SEZARGH 5 of the adapters, said adapters having notches opening outwardly of the adjacent ends thereof, a hook formed integral with one of said mounting brackets and detachably engaging the notch of one of the adapters, a hook reciprocally mounted on the barrel of the telescope sight and detachably engaging the notch of the other adapter, Spring means yieldably biasing said last mentioned hook toward the last mentioned adapter notch, a sleeve adapted to be reciprocally disposed on the telescope sight barrel and forming an integral part of said last mentioned hook, said sleeve having an internally restricted end adapted to slidably engage the sight barrel to support one end of the sleeve thereon, and a collar adapted to be mounted on the sight barrel and on which the opposite end of said sleeve is slidably mounted ROBERT R. HARDGROVE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,401,825 Gruver June 11, 1946 2,450,466 Carlson Oct. 5, 1948 2,475,383 Foster July 5, 1949

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