US1491141A - Sight for machine guns - Google Patents

Description

OR 19491 1A1 M. L. JOHNSTON SIGHT FOR MACHINE GUNS Filed Aug. 20, 1917 l a T a n at u Patented Apr. 22, 1924.

UNITD STTS MILLARD L. JOHNSTON, 0F U'IICA, NEW YORK.

SIGHT FOR MACHINE GUNS.

Application filed August 20, 1917. Serial No. 187,219.

To all whom it may concern:

Be it known that I, MILLARD L. J OHN- STON, a citizen of the United States, residing at Utica, in the county of Oneida and State of New York, have invented certain new and useful Improvements in Sights for Machine Guns, of which the following is a specification, reference being had therein to the accompanying drawing.

My invention relates to a sight for machine guns, and I declare the following to be a full, clear, concise and exact description thereof suflicient to enable anyone skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings in which like reference characters refer to like parts throughout the specification.

The object of the invention is to provide a simple, efficient sight for that class of firearms, known as machine guns. Moreover, the sight can be adjusted, as to elevation, very quickly, whereby to further adapt it to the class of firearms mentioned.

The object will be understood by referring to the drawings in which:

Fig. l is a perspective view of the sight, showing the leaf in raised position;

Fig. 2 is a perspective detail view of a plate employed;

Fig. 3 is a transverse section of the leaf, taken on the ,line 3-3 of Fig. 1;

Fig. 4 is a central longitudinal section of the sight, showing the leaf down;

Fig. 5 is a fragmentary detail view of a base member employed, showing a lug thereon.

Referring more particularly to the drawings, the sight embodies a leaf or frame 1 whose sides 22 are beveled at 33, whereby to reduce their thickness along the inner edges thereof adjacent the plate 4. Furthermore, the sides 2 are each provided with a longitudinal beveled recess 5 for the sliding reception of the plate l having correspondingly beveled edges to fit the recesses 5. The plate 4: has a V shaped recess 6 adapted to form an open sight and just below the V shaped sight 6, a small aperture 7 adapted to form a peep sight. The aperture 7 is located just below the V shaped recess 6 in order to aid the eye of the marksman in finding the same when sighting the gun.

The plate 4: has fixed thereon, as part thereof, an integral member 10 provided with the yielding ends 11-l1 which have in each instance a horizontally disposed tooth 12. The teeth 12 are adapted to engage or mesh with the teeth of the racks 1313 formed along the sides 2. The teeth of the racks 13 will be made very fine in order to permit of a very accurate adjustment of the plate 5 as to elevation.

The lower part of the frame -1 has trunnions 1515 adapted to fit into corresponding bearings made in the enlarged ends of the base members 16-16, whereby the leaf or frame 1 may be turned upon its trunnions 15. The leaf 1- is held in upright position by a flat spring 17 that is made integral with the base members 16, being partially separated therefrom along its sides from the free end to the shoulder 18. The cuts separating the sides of the spring 17 from the base members 16 terminate in round holes A, which aid in giving elasticity and durability to the spring 17. The lower part of the leaf 1-- has an enlarged part or lug 20, two of whose surfaces rest each in turn upon the free end of the spring 17, whereby to hold the leaf 1- in either upright or closed position. In this instance, the free end of the spring 17 will press alternately against the respective faces of the lu 20 to hold the leaf 1 in either upright or closed down position and will yield sufficiently to permit the leaf 1- to turn upon its trunnions 15.

The members 16 are united by the part 19 which is again shouldered at 21 to form a platform for the upper end 22 of the frame or leaf -l. The end 22 is protected, when turned down, by the elevations 23 of the members 16.

The members 16 and part 19 formed therebetween have a depending tenon 24: adapted to fit into a mortise 25 made in the receiver 26 of the gun, whereby the sight is held in assembled position. The joint is secured in a tight fitting manner by reason of an open transverse slot 27 that aids in the yielding tendency of the lower portions of the tenon, which are permitted to spring slightly after being assembled to the mortise. The enlarged cylindrical part 28 of the slot- 27 increases the yielding tendency of the lower parts of the tenon 24. The ends of the members 16, opposite that to which the part 19 adjoins, are provided with the projections 30 that fit into corresponding recess formed in the receiver 26 of the gun, whereby to aid in holding the sight in correct location with reference to the gun.

In operation, the leaf 1 will be kept turned down usually, and will be turned up when sighting. The plate 4 can be moved up or down on the leaf 1 to get the correct elevation by manipulating the same with the fingers. When moving the plate 4, the ends 11 of the member 10 will yield sufficiently to allow the teeth 12 to ride over the teeth of the racks 13 and will automatically engage the adjacent teeth of the racks 13 when the plate 4 comes to rest. A graduated scale denoting the proper elevations with respect to the corresponding distances will be marked along the sides 2 of the leaf 1-.

Having thus described my invention,

what I claim as new and desire to secure by Letters Patent is:

1. In a sight for machine guns, a leaf adapted to turn within a given arc, a plate having a sight therein mounted on said leaf, a member formed integral with said plate and having yielding ends, whereby to engage the leaf to hold the plate at any given position along said leaf.

2. In a sight for machine guns, a leaf adapted to turn Within a given are, a spring for holding said leaf in position, a plate having sights therein and mounted on said leaf, a member formed integral with said plate and having yielding ends, and a tooth on each of said ends, whereby to hold the plate at any given position along said leaf.

In testimony whereof I have afiixed my signature.

MILLARD L. JOHNSTON.

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