US874914A - Back-sight for small-arms. - Google Patents

Description

PATENTED DEC. 24; 1907.

G. NORMAN. BACK SIGHT FOR SMALL ARMS.

APPLICATION FILED JAN. 13, 1906.

2 SHEETSSHEBT 1.

WJTNESS'ES N V E N TO R LQ'eO/IyeJ/JIWZWZ- zfgl/ I x 0 I P ATENTED DEC. 24, 1907.

G. NORMAN; BACK SIGHT FOR SMALL ARMS.

APPLIGATION'IILED JAN. 13. 1906.

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ing screw detached from UNITED STATES PATENT OFFICE.

GEORGE NORMAN, OF SMALL HEATH, NEAR BIRMINGHAM,

SMALL ARMS COMPANY LIMITED, OF SMALL HEATH. NEAR HALF TO THE BIRMINGHAM BIRMINGHAM, ENGLAND.

ENGLAND, ASSIGNOROF ONE- BACK-SIGHT FOR SMALL-ARMS.

Specification of Letters Patent.

Patented Dec. 24, 1907.

Application filed January 13. 1906- Serial No. 295,925.

To all whom it may concern:

Be it known that I, GEORGE NORMAN, a subject of the King of Great Britain, residing at 271 Charles road, Small Heath, near Birmingham, England, assistant engineer, have invented certain new and useful Improvements in Back-Sights for Small-Arms, of which the following is a specification.

This invention has relation to an improved adjustable back sight, which is principally adapted for use in connection with miniature rifles and air-rifles, but is alsoapplicable to other small arms.

The principal object of the invention is to provide a simple but efficient combination back-sight in which the leaf is capable of an exact vertical adjustment for elevating and depressing the sight-bar to suit different ranges or distances, and also of an exact lat-,

eral adjustment to compensate for windage.

Figure 1 of the accompanying drawing represents a side elevation of a miniature rifle back-sight constructed in accordance with this invention and designed to admit of the various adjustments above referred to. Fig. 2 is a longitudinal section of the said sight, and Fig. 3 is a plan of the same, with the fore part drawn in horizontal section to show the arrangement of the means provided for effecting the lateral or wind-gage adjustment of the sightbar. Fig. 4 is another view, similar to Fig.3, but showing the laterally adjustable sight-bar and its adjustthe leaf of the sight.

1g. 5 represents the said separated parts in side elevation: the head of the leaf being also shown in vertical section, and Fig. 6 shows the same parts in end elevation. Figs. 7 and 7 represent two transverse vertical sections taken upon the dotted line as Fig. 1 and showing the adjustable sight bar in two different positions. Fig. 8 represents two detail sections taken respectively upon the dotted lines x and m Fig. 5.

The same letters of reference indicate corresponding parts in the several figures of the drawings.

In the improved sight represented in these figures, the leaf (1 which carries a laterallyadjustable sight-bar b is adapted to be raised or elevated by a screw andnut adjustment 0, d, in which the nut d, when rotated in one direction, is adapted to travel upon or ride along incline d ramps or bearingse arranged on to swing vertically the opposite sides of a fixed bed fand soimpart an upward angular movement to theleaf, while the lowering or depression movement is obtained by the action ofa springg when the adjustingnut is run back. By providing the rotative nut upon the stem provision is made whereby liability ofthe shifting of the sight after adjustment through accident is reduced to aminimum. Thisis evident owing to the fact thatthenut is practically self-locking and cannot be displaced by a push or a blow,but only by apositive rotative movement. Thus, the bed or body of the sight is formed, at a short distance inwards of its rear end, with a pair of laterally separated ears or lugs f :between'which is jointed the stem a of a leaf a adapted to have an angular movement in a vertical plane or from the said joint in the longer direction of the barrelupon which the sight is mounted, the said stem being guided and steadied in its movement byforming its forward part a with square or flat sides and arranging for same to fit closely and *work between a pair of flat-faced guide pieces f rising from the forward end of the bed and coming behind the head of the leaf. The stem of the said leaf is wormedto form'the screw 0, and is provided withthezmilled or knurled adjusting nut d, which has at one end (preferably the forward end) a='conoidal caring collar d adapted toengageor seat itself upon the edges e of a pair of inclined ramps or flanges eformedon the opposite sides of the bed and sloping gradually upwards from the rear end of the said-bedtowards the guide pieces at the forward end thereof," the arrangement being such that when the nut is rotated in one direction, it advances upon the screw and its bearing collar rides along or traverses up the inclined planes with the resultthat'the leaf is-compelled to make an 'upward angular movement upon its j ointand so gradually elevate the head end and notched sight bar which is mounted thereon, whereas by rotating the nut in the reverse direction, it runs down the screw and admits of-the leaf head and sight bar being depressed by the action of a suitably applied spring such'as g, whichis also utilized to keep the elevating nut down against its bearing on the inclined ramps. This spring 9 is preferably secured in a space between the ramps and is formed in such a -or channel it compris the sight-bar base is the nut of the adjustment.

the sight-bar to the leaf manner that its free end 9 will exert an upward pressure against a tail or rearward extension 0, of the leaf stem at a point beyond elly-mounted in the head of the leaf but is confined against traversing movement so that its rotation in the one direction or the other will slide the sight bar either to the right or to the left, in addition to which the said screw serves as the means for retaining the elements of the dovetail connection in engagement with one another. Thus the front edge of the head a is formed with an open-fronted and openended dovetail groove ng an inner part it (which may conveniently be of a circular section) and an open-fronted portion h of less width than the part h The back edge of provided with a rib or feather 'L of corresponding dovetail form, consisting of a barrel part i adapted to have a sliding fit within the inner part h of the channel h, and a flat shank i which extends through the open-fronted part b of the groove and unites the sight bar to the barrel 1' which is screwed internally and constitutes The swiveling adjusting screw 3' is directed along the inner art it ofthe groove so as to engage with the nut of the sliding sight bar, while to prevent its lateral displacement without affecting its swiveling or rotatory movement in both directions and also to facilitate the fitting of in assembling the parts of the sight, the shank of the said screw carries a collar j which normally engages with and is free to swivel within an open fronted recess 9' cut in the front of the leaf head at right angles to the groove h.

The sight-bar is assembled to the head by first passing the screw through the front of the groove It and engaging the collar j with the recess so that the head of the said screw will abut against the left hand end of the leaf-head, after which, the dovetail-like rib of the sight bar is introduced into the right hand end of the said groove It so as to present the barrel nut to the screw, when by rotating the latter, the threads of the screw and nut are engaged and the sight bar is drawn into its assigned position, and when thus engaged, the mutual connection exist- I by a screw and nut adjustment in which the nut element is carried by the adjustable bar while the screw is swiving between the collared screw, the dovetailsectioned nut of the sight bar and the grooved leaf head prevents the sight bar from beingwithdrawn lengthwise from the end of the said groove and also prevents the screw from being lifted through the open front thereof without affecting the lateral adjustability of the sight bar.

The movable parts of the sight are provided with a system of vernier scales or graduations to facilitate the various adjustments. For instance, the edge of one of the ramps may be marked with graduations spaced apart to distances corresponding to one rotation of the elevating nut, while the bearing collar of the said nut is marked with other graduations, which, when used in conjunction with the marks on the ramp admit of a very fine and exact elevation or depression adjustment being readily obtained. The sliding sight bar is also marked with a series of close graduations which are used in conjunction with a single mark or index at the center of the leaf head and thereby facilitates the exact or delicate lateral ad justment of the said bar for windage. The head of the wind-gage screw may also he graduated for facilitating the fine lateral adjustment of the sight-bar.

Having fully described our invention, what we desire to claim and secure by Letters Patent is I 1. In a back sight for fire arms, the combination with the sight bar having a hinged screw stem, of a nut rotatable upon and traversing the said stem, and inclined ramps carried on the bed of the sight and upon which the said nut rides for obtaining elevation adjustment.

2; In a back sight for fire arms, the combination with the sight bar having a hinged screw stem, of a nut rotatable upon and traversing the said stem, inclined ramps carried on the bed of the sight and upon which the said nut rides for obtaining elevation adjustment, and a spring permanently influencing the hinged stem and adapted to act upon the same at a point beyond its center so as to oppose the upward angular movement which the said stem is constrained to make by the traversing of the adjusting nut along the ramps, thereby holding the sight absolutely steady in all positions.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

GEORGE NORMAN.

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