US2449551A

US2449551A - Telescope mount

Info

Publication number: US2449551A
Application number: US597052A
Authority: US
Inventors: John C Garand
Original assignee: US SEC WAR
Current assignee: United States, WAR, Secretary of; US SEC WAR
Priority date: 1945-06-01
Filing date: 1945-06-01
Publication date: 1948-09-21
Anticipated expiration: 1965-09-21

Description

Sept 21, 1948. J. c. GARAND 2,449,551

TELEscoPE MOUNT Filed June 1, 1945 2 Sheets-Sheet 1 patented Sept. 211, 1948 TELESCOPE MOUNT John C. Garanti, Springfield, Mass., assignor to the United-r States Vof Americav as represented by the Secretary of War Application June 1,l 1945,A Serial No. 597,052

(Granted under the act of- March 3, 1883, as

amended April 30, 1928; 370 O. G. 757) 3 Claims.

The invention described herein may be manufactured and used :by or for the Government for governmental purposes without the payment to me of any royalty thereon.

This invention relates to improvementsrin iire arms and is directed more particularly to an im,- proved means whereby a telescopic sight may be mounted thereon.

This invention is especially adapted for use in association with a shoulder rifle, Such as the U. S. Rifle Cal. .30, Ml, and accordingly, the showing and description will apply to such a combination, but it is to be understood that the novel. features of the invention are not to be restricted thereto.

It is a particular object of the invention to provide a telescopic sight mount which may be rigidly associated With the rearm and as a special feature there is provided novel means whereby the mount is easily assembled lor disassembled. It has been a problem in militar-Y Service to provide a sight mount which is easy to clean or repair in case of injury thereto and it has been a common objection to mounts heretoforeA known that they become clogged with dirt or other foreign matter and are thereupon rendered uniit for service or at least incapable of quick removal from or assembly to the rearm, as is desirable for obvious purpose.

Furthermore, it is an essential requirement for all removable telescopic sight mounts that they assemble each time in identical relationship to the firearm so as to eliminate any necessity for re-targeting the Weapon upon reassembly of the telescope thereon.

It is accordingly the principal object of this invention to provide a sight-mounting construction Which may be readily removed and replaced as often as is necessary, With a reasonableguarantee that the sight will be positioned in the same location relative to the barrel. That is to say, the arrangement is such that the operator of the firearm is assured of accurately replacing the sight With respect to the longitudinal axis of the barrel without diiliculty.

The specic nature of the invention as well as other objects and advantages thereof will clearly appear from a description of a preferred embodiment as shown in the accompanying drawings in Which:

Fig. 1 is a side elevational view of a telescope assembled to a rearm by means of a mountA in accordance with this invention.

Fig. 2 is a sectional view of the sight mount of Fig. l, taken along the plane 3-3.

Fig. 3 is a front elevational View of the base member of theimproved sight mount.

Fig. fi is a side View of the base member.

Fig. 5 is a side elevational view of the sight mount, taken from the side opposite to Fig. 1.

Fig. 6 is a side elevational view of a telescope assembled to a firearm by means of a second modification mount `constructed in accordance with this invention.

Fig. 7 is a front elevational view of the modified mount shown in Fig. 6.

Fig. 8 is a side elevational View of the modified sight mount taken from the side opposite Fig. 6.

In Figs. 1 and 2 there are partially sho-wn conventionai elements of a rearm including a telescope i, a barrel 2, receiver 4, and handguardor stock member 3. rIhis assembly is shown for purposes of description only, and as will be understood, it does not form any part of the invention. The handguard 8 surrounds the barrel 2 but terminates forwardly of the receiver so as to provide a convenient space for mounting to the firearm an element it which may be referred to as a sight base.

The base l0 comprises a generally semi-cylindrical member having exterior planar side and top surfaces 2A and 25 respectively. For purposes of strengthening the construction, it is desirable that the side plate portion 24 and top plate portion 2E be of substantial thickness,

The interior, semi-cylindrical surface Ii of the base -i is shaped to snugly surround the barrel 2. An,v inwardly projecting tooth I 2 is provided on base I0 Which engages in one of a pair of longitudinal grooves 1 conventionally provided onthe side of the barrel to initially position the sight base in proper angular relation to the barrel 2. A transverse hole i3 is provided in hase I0 passing thru side surface 24. Utilizing the -hole `i3 Vas a jig, an extension hole 5 is drilled into barrel 2. Permanent, rigid assembly of the sight base i0 to the barrel 2 is then accomplished by vdriving-a dowel pin IA into holes I3 and 5 and then expanding the dowel pin I4.

The top and bottom edges -of side surface 24 are formed to provide

beveled surfaces

29 and 55 respectively. A threaded transverse opening 22 is also provided centrally in side plate portion 24 of base lil which communicates with a vertical opening 25 which extends thru the top plate portion 25. The opening 25 facilitates the cleaning of the threads of threaded hole 22.

A bracket member 4a is provided to mount the telescope I to the base IQ. The 'bracket member comprises a semi-cylindrical scope securing portion 4I integrally formed with a depending mounting portion 42.

The top edge of scope securing portion 4I has integrally formed thereon a plurality of spaced hinge brackets 43. drical scope securing portion 44 is provided having integrally formed spaced hinge brackets Y45. The two semi-cylindrical scope securing portions 4I and 44 are held in pivotal relationshipV by a pin 45 which passes through the aligned hinge brackets 43 an-d 45.

The mounting portion 42 of bracket member 45 y 4.

its bottom with projecting,

is provided at v cbliquely planar surface 4'I which is shaped'to cooperate with the bottom beveled surface on the sight base lil. At the top of bracket portion 42 an outwardly projecting web 48 is provided which has a horizontal bottom surface 49 which in assembly engages the planar top surface 26 of the sight base ID.

Two spaced, raised bearing surfaces U are also provided on the face of mounting portion 42 which lies adjacent the sight base I6 and these bearing surfaces engage the planar side surface 24 of the sight base. The projecting beveled surface 41 on the mounting portion 42 is preferably located centrally with respect to the raised surface 5) so as to provide three-point locating contact between mounting portion 42 of the bracket' member and the sight base I2. It will be noted that a tri-plane contact is provided between bracket member 4i) and base IS, thus insuring the identical angular positioning of bracket member 4I] with respect to the firearm in each assembly.

The bracket member 4B may be assembled to the sight base Ill without removing the handguard 8 by bringing the mounting portion 42 into abutting engagement with the base I0. The bracket member 4G is secured in identical longitudinal position on sight base Ill in each assembly by means of a bolt 52 which passes through a central hole 53 in mounting portion 42 and threadably engages the horizontal threaded hole 22 in sight base l0.

An enlarged cylindrical knob portion 54 is suitably secured to the outwardly projecting end of bolt 52. The periphery of knob 54 is provided with serrations 55 to permit the manual application of a substantial rotative force to the bolt 52, thus drawing the bracket member 4D tightly against the sight base I0. A dish-like washer 56 is preferably provided between operating knob 54 and the adjacent surface of mounting portion 42.

If desired, the serrations 55 may be extended to the vertical surface 5'I of the knob 54 which lies adjacent the mounting portion 42 and a detent 58 provided having a cylindrical body portion 64 press fitted in a suitable hole in mounting portion 42. Detent 58 cooperates with such serrations and thus provides a lock for the bolt, 52.

The telescope I is secured to the mount byl insertion thereof between the two semi-cy1indri-- A cooperating, semi-cylinceiving bore 52.

cal scope securing portions 4I and 44 and these portions are then brought into tight engagement with the telescope by means of screws 59.

An alternative construction of the bracket member 4B is disclosed in Figs. 6, 7 and 8. In this construction the scope securing portion 60 is formed entirely in one piece with mounting portion 42. Scope securing portion B0 comprises a cylindrical member which is split at its base as indicated at 5I. The telescope I is inserted withinthe cylindrical bore 62 defined by the scope securing portion 65 and is rigidly secured therein by means of screws 53 which pass through the split portion 6I of member SEI and when tightened reduce the diameter of the scope re- The mounting portion 42 of this modification is substantially identical to that previously described and cooperates in the same manner with the sight base I0 with the exception that two spaced oblique bearing surfaces 5I are provided to cooperate with surface 4I of the having a substantially semi-cylindrical concave surface shaped to snugly engage said barrel, an inwardly projecting tooth on said sight base engageable in said barrel groove to angularly position said sight base thereon, said sight base having a transverse hole therethrough whereby an aligned hole may be produced in said barrel by utilizing said transverse hole as a jig, and an expanded dowel pin communicating between said aligned holes.

2. The combination defined in claim 1 wherein said sight base has a plurality of exterior, planar bearing surfaces, each parallel to the barrel axis when assembled thereto and respectively disposed in a horizontal, a vertical and an oblique plane,

-' a bracket member includinga scope mounting lyprojecting toothon said base member engageable in the groove of the barrel so as to angularly position said base member thereon, said base member being provided `with a transverse hole therethrough for aligning with the transverse recess in the barrel and with a trio of exterior planar bearing surfaces, each ofsaid bearing surfaces being parallel to the axis of the barrel but respectively disposed on a horizontal, a vertical and an voblique plane withrespect to the base member, and screw means for releasably se- 10 curing said bracket member to said base member.

JOHN C. GARAND.

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

UNITED STATESI PATENTS Number Name Date 681,202 Dezeng Aug. 2'7,V 1901 2,368,954 Weaver Feb. 6, 1945