US2774142A

US2774142A - Telescope sight mount for firearms with elevation and windage adjustment means

Info

Publication number: US2774142A
Application number: US430216A
Authority: US
Inventors: Ernest T Lake; Robert R Hardgrove
Original assignee: Individual
Current assignee: Individual
Priority date: 1954-05-17
Filing date: 1954-05-17
Publication date: 1956-12-18
Anticipated expiration: 1973-12-18

Description

Dec. 18, 1956 E. T. LAKE ETAL 2,774,142

TELESCOPE SIGHT MOUNT FOR FIREARMS WITH ELEVATION AND WINDAGE ADJUSTMENT MEANS Flled May 17 1954 United States Patent TELESCOPE SIGHT MOUNT FOR FIREARMS WITH ELEAVBASTION AND WINDAGE ADJUSTMENT ME Ernest T. Lake and Robert R. Hardgrove, Livingston, Mont.

Application May 17, 1954, Serial No. 430,216

4 Claims. (Cl. 3350) This invention relates to telescopic sight mounts for firearms of extremely simple construction which may be very economically manufactured yet which, due to its unique construction, includes means whereby elevation and windage adjustments may be made for the telescopic sight.

A further object of the invention is to provide a telescopic sight mount involving a minimum number of parts forming a unique combination and wherein certain of the parts accomplish dual functions enabling the accomplishment of the elevation and windage adjustments.

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 plan view showing the sight mount in an applied position supporting a telescopic sight;

Figure 2 is a fragmentary side elevational view on an enlarged scale of a portion thereof;

Figure 3 is a fragmentary bottom plan view of the sight mount portion illustrated in Figure 2; a

Figure 4 is an enlarged longitudinal sectional view taken substantially along a plane as indicated by the line 4--4 of Figure 1;

Figure 5 is a cross sectional view through the rear unit of the sight mount taken substantially along a plane as indicated by the line 55 of Figure 4, and

Figure 6 is an enlarged cross sectional view through the front unit of the sight mount, taken substantially along a plane as indicated by the line 6-6 of Figure 1.

Referring more specifically to the drawing, the improved telescopic sight mount comprises two mounting units, designated generally 8 and 9. The mounting unit 8 includes a base 10 and a sight barrel engaging clamp 11. The mounting unit 9 includes a base 12 and a sight barrel engaging clamp 13.

The base 10 of the unit 8 comprises an elongated bar of substantially uniform width from end-to-end thereof having substantially parallel side walls 14. The bottom 15 of the bar 10 is slightly arced transversely from end-toend thereof to provide a slightly concave face and said bottom surface 15, as seen in Figures 3 and 5, is preferably grooved longitudinally. The bar 10 is provided near its ends with openings 16 extending therethrough having enlarged upper ends 17 which open outwardly of the top surface 18 of the bar 10. Said top surface 18 is flat and smooth with the exception of the openings 16 and is inclined from end-to-end thereof, as illustrated in Figures 2 and 4. Headed threaded fastenings 19 are turnably disposed in the openings 16 and have the heads thereof countersunk in the enlarged opening portions 17. T he fastenings 19 are adapted to threadeclly engage threaded sockets 20 which open through the upper surface 21 of a firearm portion, such as the receiver of a rifle, and said threaded sockets 20 are longitudinally spaced whereby when the fastenings 19 are engaged thereby the base 10 will be disposed on top of and longitudinally of the firearm portion 21. Said firearm portion 21 is transversely 2,774,142 Patented Dec. 18, 1956 and convexly arced and the bottom surface 15 is concavely arced transversely to fit flush thereagainst, as seen in Figure 5. The base 10 is secured to the firearm portion 21 so that its top surface 18 will be inclined downwardly and forwardly toward the muzzle end of the firearm.

The clamp 11 constitutes a modified split ring having a circular opening 22. The clamp 11 has a thickened base or bottom portion 23 provided with a downwardly opening notch 24 of a width greater than the width of the base 10 and of a depth less than the depth of said base 10 at the lower end of its sloping top surface 18. The top surface 25 of the notch 24 is inclined or sloped from side to side of the ring, as seen in Figure 4, corresponding to the slope of the base surface 18. The notch 24 forms depending legs 26 forming bottom portions of the clamp bottom 23 and which are provided with threaded bores 27 which open into the notch 24 and outwardly of side edges of the clamp 11 to threadedly receive set screws 28 having rounded inner ends 29. The top portion of the clamp 11 is centrally split as seen at 30, the split 30 forming a gap between the

top clamp portions

31 and 32. The clamp portion 31 has a threaded bore 33 extending therethrough one end of which opens into the gap 30 and aligns with a larger unthreaded bore 34 of the clamp portion 32. The opposite end of the unthreaded bore 34 is enlarged as seen at 35 and opens outwardly of the clamp 11. A screw 36 turnably engages the bore 34 and threadedly engages the bore 33. The head 37 of the screw 36 turnably fits in the bore portion 35 and abuts against the inner end thereof.

The base 12 of the other sight mount unit 9 is preferably circular and has a diametrically extending grooved bottom portion 38 which seats flush on the firearm top surface 21 in longitudinally spaced relationship to the base 10 and which is detachably secured thereto by a pair of screw fastenings, not shown, which extend through diametrically spaced openings 39 in the base 12, which correspond to the

openings

16, 17, and which open through the grooved bottom 38 near the ends thereof. The base 12 is provided with a centrally disposed frustoconical shaped bore 40 which extends therethrough from top to bottom thereof and which is tapered toward the top surface of the base 12.

The clamp 13 is formed of two substantially

identical sections

41 and 42 having substantially flat bottom surfaces 43 which rest upon the top surface of the base 12. Said top surface of the base 12 is substantially flat and level. The

clamp sections

41 and 42 have lugs 44 which depend from the inner ends of their bottom surfaces 43 and which extend into the base opening 40. The lugs 44 have outer sides which are substantially semicircular in cross section and which taper upwardly toward the bottom surfaces 43 and are shaped to engage flush against the wall of the bore 40 when the bottom surfaces 43 are resting on the base 12. The clamp 13 has upper end portions 31a and 32a of its

sections

41 and 42, respectively, which correspond with the

upper clamp portions

31 and 32, respectively. The clamp portion 31a is provided with a threaded bore 330, corresponding to the bore 33 and the upper clamp portion 32a is provided with a bore 34a, 35a, corresponding to the

bore

34, 35, as best seen in Figure 6. Said bores are engaged by a screw 36a, 370, corresponding to the

screw

36, 37. The

clamp sections

41 and 42 are provided with corresponding substantially semicircular inwardly opening notches combining to form a substantially circular opening 45 when said clamp sections are disposed in slightly spaced apart relationship to one another and in upright positions on the base 12 and with the lugs 44 abutting against the wall of the bore 40. When the

clamp sections

41 and 42 are thus disposed a gap 46 exists between the upper and lower portions of the clamp sections, as seen in Figure 6.

The unit 8 preferably constitutes the rear telescope sight mount unit and the unit 9 preferably constitutes the front sight mount unit. Assuming that the

bases

10 and 12 are secured as previously described to the upper surface of the firearm portion 21 in longitudinally spaced relationship to one another, the fastening 36 is loosened to allow the clamp opening 22 to be enlarged so that a barrel 47 of a conventional telescopic sight 48 may be inserted through the clamp opening 22. The fastening 36a of the clamp 13 is loosened substantially so that the

upper portions

31 and 32 of the

clamp sections

41 and 42, respectively, can be swung to move the lugs 44 into abutting engagement so that said lugs can be inserted downwardly into the base bore 40, after which the lower portions of the

clamp sections

41 and 42 are displaced apart to their positions of Figure 6. With the fastening 36a still loosened, the sight barrel 47 can be inserted through or into the clamp opening 45, and with the setscrews 28 retracted out of the notch 24, said notch can be positioned to engage over the base 10 and with its top surface 25 resting on the top surface 18 of the base. The screws 28 are then advanced inwardly into the notch 24 and into clamping engagement with the sides 14 of the base 10. The fastenings 36 and 3611 are then tightened for clamping the sight barrel 47 in the clamps 11 and 13. This operation completes the mounting of the telescopic sight 48 on the firearm portion 21 by the

mounting units

8 and 9. As the fastening 36a is tightened the lugs 44 are displaced forcibly into flush engagement with the wall of the bore 40 and while the upper clamp portions 31a and 32a are drawn together for restricting the opening 45 to clamp the sight barrel 47 therein. The clamp 11 is sufficiently resilient so that its

upper portions

31 and 32 can be drawn together by the fastening 36 for restricting the bore 22 to clamp the barrel 47 therein.

It will be noted that when the fastening 36a is loosened that the lugs 44 are capable of turning in the bore 40. To accomplish a windage adjustment of the telescopic sight 48, the fastening 36a is loosened after which one of the setscrews 28 is retracted and the other setscrew 28 is advanced whereby the clamp 11 is diplaced laterally of the base 10 to accomplish a desired windage adjustment of the telescopic sight 48 by laterally moving the axis of the telescopic sight barrel 47 to a position at an angle to the longitutdinal axis of the firearm par-t 21. This is made possible since the loosened clamp 13 is capable of swiveling on the base 12 as the rear portion of the telescopic sight 48 is moved laterally.

To accomplish an elevation adjustment, the fastening 36a-is loosened after which the two fastenings or setscrews 28 are loosened so that the clamp 11 can he slid longitudinally of the base 10 and while the barrel 47 is sliding through the clamp 13 to move the inclined notch surface 25 upwardly or downwardly along the inclined base surface 18 for either lowering or elevating the clamp 11 relatively to the clamp 13 for accomplishing elevation adjustments. After the desired elevation adjustment has thus been accomplished the setscrews 23 are returned to their initial positions for securing the clamp 11 to the base 10 and the fastening 36a is re-tightened for clamping the sight barrel 47 in the clamp 13.

It will be obvious that both elevation and windage adjustments may be accomplished at the same time and that any windage adjustment may be made with any elevation adjustment or vice versa.

Various 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 claims.

We claim as our invention:

1. In a telescopic sight mount for mounting a telescopic sight above a firearm portion and longitudinally thereof, a mounting unit including a base, means securing said base to a top portion of a firearm, said base comprising an elongated block adapted to be disposed longitudinally of the firearm and having a top face inclined from end-to-end thereof relative to the top portion of the firearm, said mounting unit including a clamp having an opening in which an end portion of a telescopic sight barrel is adapted to be clamped, said clamp having a bottom portion provided with a downwardly opening notch loosely straddling the base ancl're'sting on the inclined top face thereof, set screws mounted in the bottom portion of said clamp and extending into opposite sides of said notch and engaging opposite sides of said elongated base to adjustably securethe clamp thereon.

ZTTI'i'a telescopic sight mount as in claim 1, said clamp having an inclined surface extending from side to side thereof defining a top portion of said notch and conf-ormably fitting the inclined top face of said elongated base, said clamp being longitudinally adjustable on the elongated base t vary the elevation.of.the barrel and engaged by the clamp relative to the other end of the telescopic sight barrel for accomplishing elevation adjustments of the sight barrel, and said set screws being selectively adjustable for laterally adjusting the clamp and the barrel end engaged thereby relative to the elongated base and to the other last mentioned barrel end for accomplishing-windageadjustments' of the'sight barrel.

3. A telescopic sight mount comprising an elongated base adapted to be secured to a top surface of a firearm portion and longitudinally thereof and having substantially parallel side walls and a top face, said top face being inclined from end-to-end of the base, a sight barrel engaging clamp having a split top portion, fastening means engaging said split top portion for restricting the clamp for securing a telescopic sight barrel therein, said clamp having a bottom portion provided with a notch loosely engaging over said elongated base and providing spaced portions of the clamp loosely straddling the base, set screws threadedly engaging said spaced bottom clamp portions and extending into the notch and engaging the side walls of the base for adjustably securing the clamp to the base, said set screws being selectively adjustable for laterally adjusting the clamp relatively to the base.

4. A telescopic sight mount as in claim 3, said clamp having an inclined surface extending from side to side thereof defining a top surface of the notch and conformably engaging the inclined top surface of the base, and said set screws adjustably securing the clamp to longitudinally spaced portions of the base for supporting the clamp in different elevated positions relative to the firearm portion on which said base is secured.

References Cited in the file of this patent UNITED STATES PATENTS 1,816,195 Redfield July 28, 1931 2,202,000 Gray May 28, 1940 2,486,002 Buehler Oct. 25, 1949 2,493,254 Leupold Jan. 3, 1950 2,585,395 Martin et al Feb. 12, 1952 2,653,386 Winton Sept. 29, 1953 FOREIGN PATENTS 21,595 Great Britain 1912 8,644 Great Britain 1912