US1198665A - Telescope-sight attachment. - Google Patents

Description

33-2415 OR 191981665 5R A. B. ROLFE-MARTIN.

TELESCOPE SIGHT ATTACHMENT.

APPLlcmou 111m rfa. 23.1916.

1,198,665. Patemedsepn 19,1916.

UNITED sTATEs PATENT oEEroE ARTHUR BERNARD ROLFE-MARTIN, OF KENTISH TOWN, LONDON, ENGLAND, ASSIGNOR TO PERISCOPIC PRISM COMPANY, LIMITED, OF KENTISH TOWN, ENGLAND.

TELESCOPE-SIGHI ATTACHMENT.

Specification of Letters Patent.

Patented Sept. 19, 1916.

Application filed February 23, 1916. Serial N o. 79,906.

To all whom t may concern Be it known that I, ARTHUR BERNARD RoLrE-MARTIN, a subject of the King of Great Britain, residing at 23 Prince of Tales Crescent, Kentish Town, in the county of London, England, have invented certain new and useful Improvements in Telescope-Sight Attachments, of which the following is a specification.

This invention relates to methods of attachment of telescope sights to firearms and more particularly to such methods as rely on the inter-engagement of dovetail members for such attachment, the chief object of the present invention being to provide an improved dovetail iitment whereby a telescope sight can be more readily and reliably attached to rifles and like firearms while permitting of ready removal and replacement.

According to the present invention the telescope tube carries a single member provided with a parallel dovetail part adapted to enter into engagement with a corresponding parallel dovetail part carried on the firearm and to be securely held when so engaged by means of a fixed stop or plate provided, for instance, on the forward end of the firearm dovetail part, and a nose on a spring catch which automatically operates at the position of abutment against said stop or plate to prevent displacement away from the same.

In the preferred construction a female parallel dovetail member may be attached to the bolt casing of the rifle by screws or other suitable means, the dovetail being closed at its forward (muzzle) end to provide a stop for a male parallel dovetail member carried by the telescope tube. A spring, which may be sunk in and along one face of the female dovetail, carries a stop at the rear end which the male dovetail depresses as it slides over it when the telescope is inserted into position and which is released and engages with the rear end of the male dovetail when the telescope is fully up to the front stop. A suitable device such as a second spring sunk in either dovetail may be provided to press the telescope attachment firmly against a face or faces ofthe female dovetail, insuring that the telescope shall always occupy exactly the same position during the process of taking aim.

In order that the said invention may be clearly understood and readily carried into effect, I will describe the same more fully with reference to the accompanying drawings, in which Figure l shows in elevation a telescope sight secured in place upon a rifle. Fig. 2 is a cross section on the line :z2- m of Fig. l, through the sight mounting and bolt casing of the rifle; and Figs. 8 and 4 show in elevation the two dovetail members.

A is the telescope tube, of which the outline only is indicated, as it forms no part of the present invention.

B is the rifle stock.

C is the bolt casing.

D is the female dovetail member fitted upon the bolt casing and E is the male dovetail member firmly secured on the tube A.

The female member D must be fitted upon the rifle with great accuracy, so that the telescope tube may lie parallel to the axis of the rifle barrel. For this 4purpose the side of the bolt casing may have two longitudinal surfaces o, o carefully machined flat to receive two corresponding surfaces on the back of the member D. rlhe face of the front wall c2 of the bolt casing may also be machined at the side against which the end plate d of the member D abuts to give a proper abutment for the member, which is preferably secured at the lower liange CZ only, by the screws Z2 entering the side of the bolt casing. These screws pass through the bolt casing and the ends projecting into the bolt chamber are filed off accurately flush with and conforming to the radius of the inside face of said chamber.

Part of the male member E is formed as a slotted sleeve e which embraces and can be fixed to the telescope tube A immediately in front of the fixed collar a shrunk on the tube and serving to prevent any forward displacement of. the telescope due to the recoil of the riie on firing.

The two dovetail members must fit with great accuracy and to prevent the male dovetail riding backward when it has been slid into position the member D is provided with a spring catch Z3 lying in a recess d* in the bottom of the dovetail, the end of the spring carrying a projecting stop which springs up behind the rear end of the member E when the latter has been pushed in until its front end meets the end plate (Z closing the front of the female dovetail.

To prevent any looseness one side of the male dovetail is recessed to receive the spring c which lies along its face and presses against the inner face of the female dovetail, but this spring does not form the actual dovetail face7 which is constituted by the narrow solid face or ledge e2 above the spring channel.

It is of great importance that the shock of firing shall not displace the sight and the shock of recoil must therefore be transmitted to the telescope tube in a manner which avoids any displacement. This is effected in the present fitting by securing the member D so that its front plate cl abuts firmly against the front Wall 02 of the bolt casing C and by securing the male dovetail so that its front end abuts against the plate (Z. Also to take the shock as near as possible to the base of the dovetail the front end of the male dovetail may be slightly recessed as shown in Fig. l to leave a nose e3 at the base projecting to meet the plate d. rThe shock is therefore transmitted through the plate (Z, male dovetail meinbergsleeve e and collar a and at no point is there danger of bending or distortion of the parts.

What I claim and desire to secure by Letters Patent of the United States is 1. A telescope sight attachment for firearms com'prising a single parallel dovetail member on the telescope tube, a corresponding parallel dovetail member on the firearm, a fixed stop on the second member deterinining the position of the telescope member and means for securing the latter member at the position of abutment against the said stop.

2. A telescope sight attachment for firearms comprising a single parallel dovetail member on the telescope tube, a corresponding parallel dovetail member on the firearm, a fixed stop determining the position of the telescope and a spring catch having a nose which engages a dovetail member at the position of abutment against the stop.

3. A telescope sight attachment for firearms comprising` Ia singlefmember on the telescope tube provided With a parallel male dovetail partha corresponding parallel female dovetail `--lmember on the firearm, a plate closing the-forward end of the female dovetail and means for holding the male dovetail in position in abutment With the said plate.

4l. A telescope sight attachment for firearms comprising a single parallel dovetail member on the telescope tube, a corresponding parallel dovetail member' on the firearm, a fixed stop determining the position of the telescope, and a spring vcatch tted to a` face of the dovetail member on the firearm and having a nose which engages the end of the telescope dovetail member when the latter is in abutment against the stop.

5. A telescope sight attachment for firearms eomprising a single parallel dovetail member on the telescope tube, a corresponding parallel dovetail member on the firearm, a fixed vstop determining the position of the telescope and a spring catch fixed in a reeess in the base of the female. dovetail member and adapted to be depressed by the male dovetail member on entry of the latter into the female dovetail and to be released automatically at the position of abutment against the stop so as to engage the male dovetail member.

6. ln a telescope sight attachment for rifles7 a dovetail member having a flange at one side, a machined face formed on the bolt easing of the rifle, on which faee the side flange of the said dovetail member is screwed and a corresponding dovetail member on the telescope.

7. A telescope sight attachment for firearms comprising coperating parallel male and female dovetail members on the telescope and firearm, a plate closing the end of the female dovetail and a progeeting nose on the end of the male dovetail adapted to,

abut against the said plate.

8. A telescope sight attachment for firearms comprising coperating parallel male and female dovetail members on the telescope and firearm, one of the dovetail faces being formed ivith a shallow recess leaving part of the face at the side uncut, and a spring fitted in the said recess and adapted to bear against the face of the second dovetail member while the dovetail fit is Y-made by the said uncut part of the face.

9. A telescope sight attachment for firearms comprising a single parallel dovetail member on the telescope tube, a corresponding parallel dovetail member on the firearm, a fixed stop determining the position of the telescope. means for securing the latter at the position of abutment against the said stop, a parallelk slotted sleeve on the first dovetail member embracing and fixed to the telescope tube and a collar fixed on the said tube as an abutment for the said sleeve.

ARTHUR BERNARD ROLFE-MARTIN.

Copies of this patent may be obtained for live cents each, by addressing the Commissioner of Patents, Washington, D. C.

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