US2017066A

US2017066A - Telescopic sight for guns

Info

Publication number: US2017066A
Application number: US747556A
Authority: US
Inventors: James C Karnes
Original assignee: Individual
Current assignee: Individual
Priority date: 1934-10-09
Filing date: 1934-10-09
Publication date: 1935-10-15
Anticipated expiration: 1952-10-15

Description

- Seam Ram 33-2469 GR 790171066 5R Oct. 15, 1935. J Q KARNES 2,017,056

TELESCOPIC SIGHT FOR GUNS Filed Oct. 9, 1954 2 Sheets-Sheet l w Inventor H Llamas E-Karnes 1 QVWWW Z A t t u r n e y nub 5;.

as @G 335 @EUNitl MEAL Hmmuwam mu Get. 15, 1935. J. c. KARNES TELESCOPIC SIGHT FOR GUNS Filed Oct. 9, 1934 2 Sheets-Sheet 2 Inventor lmlmll 742 $1 Llamas G-Karnas Ely Attmrne lllo M ENTS.

Patented Oct. 15, 1935 UNITED STATES PATENT OFFICE Application October 9,

5 Claims.

1934, Serial No. 747,556

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

amended April 30, 1928; 370 0. G. 757) 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 a telescopic sight for guns.

The purpose of the invention is to provide a telescopic sight for guns in which range or elevation is applied bymoving a reticle and in which correction for drift is applied by moving the reticle on an incline with respect to the vertical plane of the axis of bore of the telescope or gun.

A further object of the invention is to arrange the sight so that it may be used with either one of two guns having different characteristics.

With the foregoing and other objects in View, the invention resides in the novel arrangement and combination of parts and. in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

A practical embodiment of the invention is illustrated in the accompanying drawings, wherein:

Fig. 1 is a plan view of a telescopic sight constructed in accordance with the invention.

Fig. 2 is a view in side elevation.

Fig. 3 is a sectional view on the line 33 of Fig. 1.

Fig. 4 is a sectional view on the line 4-4 of Fig. 2.

Fig. 5 is a view in side elevation of the range drums.

Fig. 6 is a sectional view on the line 6-6 of Fig. 1.

Referring to the drawings by characters of reference, there is shown a telescope formed of the usual tube 5 adapted to be mounted in a front bracket 6 and a rear bracket 1 attached to the gun 8. A collar 9 on the tube 5 has a rounded surface engaging the front bracket 6 whereby the tube is capable of pivotal movement. A collar II] on the tube is held against the inturned flange I I of the rear bracket 1 by means of a ring I2 encircling and spaced from the tube and threaded into the rear part of the bracket.

The collar ID has a plurality of plane surfaces I3-I3 preferably four in number, each surface being engaged by a screw I4 threaded in the rear bracket 1. The screws l4 support the rear end of the tube 5 and enable it to be displaced about the front bracket as a pivot to position the axis of the tube 5 parallel to the axis of bore of the barrel of the gun.

The rear or eye-piece portion of the tube (Fig. 3) is formed of two parts I5 and I6 held together by screws I l and cooperating to provide a chamber I8. Within the chamber there is a frame I9 carrying a transparent plate 20 etched with a reticle 2|. The frame is mounted for vertical sliding movement at a slight incline to the true vertical axis of the tube 5, the purpose of the incline being to enter a correction due to drift as will be described more fully hereinafter.

One side of the frame I9 is slidably fitted in a groove 22 formed in the parts l5 and I6 of the tube. The opposite side of the frame is provided 15 with a guide ring 23 and a nut 24, the former embracing a smooth part of a shaft 25 and the latter engaging a threaded part 26 of the shaft. The shaft 25 is arranged at a slight incline to the vertical axis of the tube 5. A nut 21 on the 20 threaded part 26 of the shaft has one face 28 hearing against the frame whereby it is held against rotation with the shaft and. is constrained to be translated with the frame when the shaft is rotated. A helical spring 29 embracing the 5 shaft and confined between the nut 21 and the guide ring 23 serves to eliminate play between the nut 24 and the threads 26 of the shaft.

When the intersection of the vertical and horizontal lines of the reticle is on the optical axis 0 of the telescope and corresponds to zero elevation, the reticle bears a predetermined positional relation with reference to the plane surfaces I3 of the collar I0 and also with reference to the axis of the elevating shaft 25 as clearly shown 35 in Fig. 6. The inclination of the shaft with respect to the true vertical axis of the tube 5 which corresponds to the zero position of the reticle shown in Fig. 6 is obtained by plotting angular elevation due to range against drift in mils.

The shaft 25 projects from the upper and also from the lower side of the tube and is held against axial displacement by means of collars 30, one of which is mounted on each projecting end of the shaft and secured by a pin 3|. A 45 drum 32, carried by the lower collar and clamped thereon by a disk 33 which is held on the collar by a screw 34, is inscribed with a range scale 35 for a .50 caliber gun. The range scale is readable against a reference mark 36 on the por- 50 tion I5-| 6 of tube 5.

A drum 3! carried by the upper collar and similarly retained by a disk 38 and screw 39, is inscribed with a range scale 40 for a .30 caliber gun, which scale is readable against a reference mark 4|. The disk 38 is formed with an annular flange 42 whereby it constitutes a hand wheel for rotating the shaft 25.

In Fig. 4 the reticle is shown in a position corresponding to zero elevation. When the shaft 25 is rotated to apply range the reticle is lowered or raised depending on the type of lens system in the telescope, the point of intersection of the reticle moving along a line which is parallel to the inclined axis of the shaft and which diverges from the true vertical axis of the tube 5 by an amount to correct the line of sight for lateral deviation due to drift.

I claim.

1. In a telescopic sight, a tube having a chamber, a shaft passing through the tube and chamber at a slight incline to the vertical axis of the tube and having a threaded portion, a frame having a guide ring on the shaft and having a nut on the threaded portion of the shaft, means for guiding the opposite side of the frame, a nut on the threaded portion of the shaft and held against rotation by the frame, a spring between said nut and the guide ring, anieticle carried by for guiding the opposite side of the frame, a reticle carried by the frame, a drum on one end of the shaft having a range scale for one calibre of gund, a drum on the other end of the shaft having a range scale for a different calibre of gun.

3. In a telescopic sight, a tube having a chamber, a shaft passing through the tube and chamber at a slight incline to the vertical axis of the tube and having a threaded portion, a frame having a guide ring on the shaft and having a nut on the threaded portion of the shaft, means for guiding the opposite side of the frame, a reticle carried by the frame, and a drum on one end of the shaft having a range scale.

4. In a telescopic sight, a tube, a shaft rotatably carried by the tube and arranged at a slight inclination to the vertical axis of the tube, range .drums for two calibres of guns carried by the shaft, a frame within the tube and movable by 20 the shaft, a reticle carried by the frame and means including the shaft for mounting the frame for sliding movement at an inclination to the vertical axis of the tube.

5. In a telescopic sight, a tube, a shaft rotat- 25