US2634537A - Adjustable choke - Google Patents

Description

APril 14, 1953 R. v. VELEZ ErAL 2,634,537

'ADJUSTABLE cHoKE Filed Dec. 1s, 194s INVENTOR$ @4F/m n raiz L am i. ,Vasa/v Patented Apr. 14, 1953 UNITED ADJUSTABLE CHOKE Rafael Villaha Velez and Lloyd E. Nelson, San Francisco, Calif.

Application December 13, 1948, Serial No. 64,946

2 Claims.

This invention relates to an adjustable choke for a shot gun.

It is an object of the present invention to provide an improved form of adjustable choke for a shot gun.

It is a further object of the invention to provide an adjustable choke for a shot gun which is capable of functioning more eiiciently.

It is a particular object of the invention to provide an adjustable choke including a compressible member which obviates certain disadvantages inherent in adjustable chokes as previously designed.

These and other objects of the invention will be apparent from the ensuing description and the appended claims.

One form which the invention may assume is exemplified in the following description and illustrated by way of example in the accompanying drawings, in which:

Fig. 1 is a side elevation of the adjustable choke of the invention showing it attached to the end of a gun barrel.

Fig. 2 is a similar elevational view taken at right angles to the view of Fig. l.

Fig. 3 is a section taken along the line 3-3 of Fig. 2.

Fig. 4 is a section taken along the line 4-4 of Fig. 3.

Referring now to the drawings, there is shown an adjustable choke generally designated as l which. as illustrated in Fig. 3, is in threaded engagement at H with a gun barrel l2. The choke l comprises a rearward or recoil section i3 having slots I4 formed therein and a forward solid tubular portion l5. As illustrated, the slots I4 are formed along the sides of the choke body, and they are disposed nearer the top than the bottom of the choke body. This is advantageous, because the gases resulting from discharge of the gun are tanned upwardly and outwardly, resulting in less recoil. As also shown, the choke body is grooved rearwardly of the slots I4 to provide ns 14a. The grooving lightens the choke and results in more rapid heat dissipation.

The forward portion I5 is formed with an internal annular ange l5a having a rearward shoulder S6 and a forward, somewhat steeper shoulder l1, and at its forward end the choke is threaded at I8 as illustrated. Disposed within the choke body is a compressible choke sleeve having forward slots 26 extending from the outer end of the sleeve inwardly but short oi the inner end of the sleeve, and alternating therewith are rearward slots 21 which are similarly formed but commence at the inner end of the sleeve and terminate short of the outer end thereof. The sleeve 25 is of uniform outside diameter but, as illustrated, it has an inside taper such that the internal diameter decreases from the rear end to the forward end thereof.

It will be seen that by this construction, including alternating forward and rearward slots, when pressure is applied to the sleeve as described hereinafter the entire sleeve will contract in diameter uniformly throughout its length.

The sleeve 25 is beveled at both ends, at 28 and 29, and the beveled rearward shoulder 28 abuts the forward shoulder l1 of the annular ange |5a.

An internally threaded cap 35 is provided having a central bore or opening 36 formed therein and also having an annular shoulder 31 complemental to and normally abutting the forward shoulder 29 of the sleeve 25. The cap 35 is also formed at its inner edge with notches 38, each having a corresponding number or indicia 39, and adjacent the inner edge of the cap 35 the choke body is grooved to provide annular grooves 40 which may he marked S for skeet, M for modified and F for full choke.

A sight generally designated as 4| is also pro- Avided, comprising a stepped body portion 42 which is secured to the choke body by means of a screw 43 passing through the sight body and through a tongue 44 formed thereunder. A latch member 45 is provided having a pointed key or pawl 46 and the latch member 45 is supported for limited sliding movement by engagement of the tongue 44 with a slot 41 formed in the latch member. The latch member 45 is urged forwardly by means of a coil spring 48 received within a socket 49 formed in the sight body 42. A prism 55 is provided, being pinned to the sight body by means of a pin 56. rlhe prism may be constructed of any suitable transparent or translucent reflecting material, such as Lucite, and it is provided with a horizontal surface 51 to receive rays of light, a diagonal or an inclined reilecting surface 58 disposed at 45 to the surface 51, and a rearward vertical surface 59 for transmitting the reected light along the gun barrel.

In assembling the structure thus described, the choke l0 is, of course, threaded on to the end of a gun barrel, the sight having been previously secured to the choke in the manner indicated hereinabove. The choke sleeve 25 is placed in Ithe forward end of the choke body until its rearward shoulder 28 abuts the forward shoulder I'I of the annular ange I 5a. The cap 35 is then threaded on to the forward end of the choke body, thus causing its shoulder 3l to abut the forward shoulder 29 of the choke sleeve, and also causing the latch member 45 to be pressed against the inner edge of the cap. The cap is screwed on to the choke body until the pawl is located in the desired notch 38. For even greater convenience, the grooves 49 are provided; when the inner edge of the cap 35 is at, say, the S groove, a mere glance will indicate the setting of the choke.

It will thus be apparent that an adjustable choke for a shot gun has been provided which is simple in construction and inexpensive to fabricate, easily assembled and mounted and very easily adjusted. The advantage of the alternate slotting of the choke sleeve has been discussed above. In performance, better bunching of the shot at any setting of the choke results from this slotting feature, and from the smooth, tapered bore from the shoulder I6 to the outer end of the sleeve 25.

The cap 35 and the latching means 45 are advantageous because they allow rapid adjustment of the choke.

The sight described above is of considerable utility in that, as indicated, light rays coming from above are reflected and more or less concentrated in a beam traveling the length of the gun barrel. This form of sight is of great ad vantage in sightinga gun against a dark background as, for example, at dusk or by starlight or moonlight. The sight may be used with a rifle to even greater advantage than with a Shot gun.

The compressible choke sleeve 25 may be replaced by a choke sleeve having a fixed diam-l eter. For example` if it is desired to use the choke I0 for a specialized purpose, as for Skeet shooting, a xed diameter sleeve (not shown) corresponding to the Skeet pattern may be substituted for the compressible sleeve 25.

While we have shown the preferred form of our invention, it is to be understood that various changes may be made in its construction by those skilled in the art without departing froml the spirit of the invention as dened in the appended claims.

Having thus described our invention, what we claim and desire to secure by letters Patent is: 1. An adjustable choke comprising a tubular choke body having an annular ange formed therein and spaced from the outer end of said body, said flange presenting a forward sloping shoulder and a rearward sloping shoulder, a cornpressible tubular sleeve adapted to be received within the forward end of saidchoke body, said sleeve being formed with shoulders at both ends and with longitudinal slots, some of which extend from one end toward but short of the other end and others extending oppositely, and a cap in threaded engagement with the forward end of said choke body and operable upon being threaded inwardly to urge said sleeve against said forward shoulder and thereby cause contraction of said sleeve.

2. An adjustable choke comprising a, tubular choke body having an annular flange formed therein and spaced from the ou-ter end of said body, said flange presenting a forward sloping shoulder and a rearward sloping shoulder, a compressible tubular sleeve adapted to be received within the forward end of said choke body, said sleeve having a forwardly tapering inside dia-meter and being formed with shoulders at both ends and with longitudinal slots, some of which extend from one end toward but short of the other end and others extending oppositely, and a cap in threaded engagement with the forward end of said choke body and operable upon being threaded inwardly to urge said sleeve against said forward shoulder and thereby cause contraction of said sleeve.

RAFAEL VILLAHA VELEZ. LLOYD E. NELSON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date Re. 20,958 White Dec. 27, 1938 282,044 Bonwill July 31, 1883 1,716,331 Stowell June 4, 1929 2,143,596 Galliot et al. Jan. 10, 1939 2,153,246 Gibson Apr. 4, 1939 2,191,484 Hughes Feb. 27, 1940 2,246,174 Howells June 17, 1941 2,348,114 Dow May 2, 1944 2,398,298 Finlay et al. Apr. 9, 1946 2,439 086 Hanley Apr. 6, 1948 2,453,121 Cutts Nov. 9, 1948 2,453,747 Egleson Nov. 16, 1948 2,465,836 Benjamin Mar. 29, 1949 2,466,104 Hilburn Apr. 5, 1949 2,476,438 Wright July 19, 1949 2,527,988 Dillon Oct. 31, 1950 2,558,200 Schmeling June 26, 1951

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