US2312150A

US2312150A - Forearm or the like for firearms

Info

Publication number: US2312150A
Application number: US332867A
Authority: US
Inventors: Benjamin F Conner
Original assignee: Colts Manufacturing Co Inc
Current assignee: Colts Manufacturing Co Inc
Priority date: 1940-05-02
Filing date: 1940-05-02
Publication date: 1943-02-23
Anticipated expiration: 1960-02-23

Description

Feb. 23, 1943. R B. F. CONNE R; v 2,312,150

I FOREARM OR THE LIKE FOR FIREARMS I Filed May 2, 1940 Jim/227i 0r .E'ezyamzh .E Conner Patented Feb. 23, 1943 FOREARM OR THE LIKE FOR FIREARMS Benjamin F. Conner, West Hartford, -Conn., assignor to Colts Patent Fire Arms Manufacturing Company, Hartford, Conn, a corporation of Connecticut Application May '2, 1940, Serial No. 332,867

9 Claims.

In various firearms, and more particularly in shoulder arms such as rifles, it has long been the practice to provide a forearm or cover or other equivalent part formed of wood and serving among other purposes to protect the user from contact with the hot barrel. With modern automatic or semi-automatic firearms such as rifles, adapted for rapid firing, diificulty is encountered by reason of the charring of the wood where it is in contact with the barrel. 'One of the objects of the present invention is to provide aconstruction wherein charring is avoided.

It has heretofore been proposed to substitute for wood a molded material of the-synthetic-class. A molded material has certain very definite advantages over wood, particularly in that it is stronger, less expensive, less subject to moisture absorption, and less subject to charring. However, the molded material has certain apparent disadvantages which have heretofore prevented its use to any great extent for this particular purpose. The molded material is somewhat heavier than wood which has made it to that extent objectionable, and it has a somewhat higher thermal conductivity which has made it less 'eiiective as a heat insulator around the barrel. A further object of the present invention is .to-prOVide a construction which overcomes the heretofore existing disadvantages of the molded material, thus making it practicable to use molded material and obtain the benefit of its inherent advantages.

In the accompanyin drawing I have shown alternative embodiments of the invention as 'applied to a firearm of one particular type' It will be understood, however, that I do not limit myself to a firearm of the particular .typ'eishown nor to the particular details of construction shown, it being understood that the drawing is for illustrative purposes only and is not to be construed as defining or limiting the scope .of the invention, the claims forming a port of this specification being relied upon for that purpose.

Of th drawing:

Fig. l is a side view of the front portion of a .rifle embodying the invention.

Fig. 2 is an enlarged transverse sectional view taken along the line 22 of Fig. *1, this view omitting all parts except the barrel andthe torearm and the heat resisting strips interposed between them.

. Fig. 3 is a view similar to Fig. 2 but showing alternative details. I

Fig. 4 is an enlarged fragmentary view similar to Fig. 1, this view being partly in longitudinal section in order to show an alternative co'nstruonected with the barrel, a stock 3, a cover 4 .and a forearm 5. The parts 3, 4 and 5 are connected with the barrel and the gas tube and with each other by means of bands or ferrules 6 and I in the conventional manner.

The stock 3, the cover 4 and the forearm 5 are formed of a non-metallic material, and the usual prior practice has been to make them of wood; but in accordance with the present invention some or all of these parts which may generally be referred to as barrel engaging members may be molded from a material of the synthetic resin class. One suitable material of this class is a phenol-formaldehyde resin having shredded canvas as a filler to provide the necessary mechanical strength. 7

In accordance with the usual prior practice, the barrel engaging members such as the cover 4 and the forearm 5 at least partly surround'the barrel and have direct contact therewith. Under conditions of rapid continuous firing the barrel may become sufficiently heated to cause objectionable c'harring of the cover and forearm, particularly when these parts are formed of wood.

In accordancew-ith the present invention, as shown in detail in Fi 2, the forearm '5 instead of contacting directly with the barrel, is so formed that its inner face is spaced outward from the barrel. I provide a plurality of strip o rrods or bars 8, 8 which are interposed between the outer face of the barrel and the inner face of the forearm. These strips, rodsor bars are formed of a heat resisting material of low thermal conductivity, as for instance asbestos or an asbestos compound. The strips 8, 8 should be molded or otherwise formed so as to be relatively hard and unyielding.

Preferably, in order to assist in definitely l'ocatin the strips 8, the forearm is provided with relatively shallow grooves into which the strips fit. As shown in Fig. 2, the strips 8, 8 and the corresponding grooves extend longitudinally and the strips are circular in cross section.

Fig. 3 shows a construction simil'ar'to that shown in Fig. 2 the principal dilierence being that there are strips '8 8 which are rectangular instead of circular in cross section, the grooves in .the forearm 5* being correspondingly shaped. As already stated, the strips 8, 8 and 8 8 as shown in Figs. 2 and 3 extend longitudinally. However, the invention is not so limited and I may provide circumferentially extending strips such as 9, 9 as shown in Fig. 4. When the strips extend circumferentially, the forearm It is preferably correspondingly grooved.

"I have described the heat resisting strips *8 and 8a .asbeing used vinconjunction with the forearm of the. rifle. It will be understood that similar .strips'may be used in conjunction with the cover 4, these not being herein shown as their construction and arrangement would be substantially the same.

Referring particularly to Fig. 2, it will be observed that the forearm 5 is spaced away from the barrel so that there is no direct contact, thus practically eliminating any possibility of charring. The strips 8, 8 of heat resisting material such as asbestos serve to connect the barrel and the forearm so as to hold these parts in proper relationship, but these strips 8, 8 will not char and will not conduct sufficient heat of the forearm to cause it to char. It will be noted the strips 8 and #3 shown in Figs. 2 and 3 and the strips 9 shown in Fig. 5 extend around the barrel a greater extent than 180 and thus serve to interlock the barrel and barrel engaging member against separation in a direction transverse to the axis of the barrel. The air space between the barrel and the forearm acts in association with the strips to provide effective heat insulation.

As already stated, the barrel engaging member such as the forearm may be formed of wood or of a molded material; but the described constructions, particularly those shown in Figs. 2 and 3, are especially adapted for use with a molded material and they make the use of such a material entirely practicable. One of the heretofore existing objections to a molded material was that it was heavier than wood and therefore somewhat increased the weight of the rifle. In accordance with the present invention the exterior contour of the forearm may be kept the same as before but the greater interior space therein to provide clearance around the barrel makes it possible for the weight of a molded forearm to at least approximate the Weight of a wooden forearm. The molded material has somewhat greater heat conductivity than the wood, but with the described construction much less heat is transmitted from the barrel to the forearm, with the result that the temperature of the forearm is never excessive.

It will be seen that in accordance with the present invention I am able to avoid the heretofore existing objections to the use of a molded forearm or other similar part. By the invention I avoid any objectionably greater weight and any unduly increased temperature. The molded forearm or other part is much less expensive, as it does not require the many machining operations necessar for wood; it has no distinct grain and is therefore not subject to splitting as is wood; and is less subject to moisture absorption and charring. The space around the barrel serves not only to reduce weight and provide heat insulation, but it also reduces the amount of material and thus still further reduces the cost.

What I claim is:

1. In a firearm, the combination of a barrel, a barrel engaging member of non-metallic material at least partly surrounding the barrel fora greater extent than 180 of the circumference thereof and spaced outward therefrom, and a plurality of spaced strips of heat resisting material of low thermal conductivity interposed between and engaging the said barrel and the said barrel engaging member, said strips being arranged around the barrel for a greater extent than 180 of the circumference thereof to interlock the barrel and the barrel engaging member.

2. In a firearm, the combination of a barrel, a barrel engaging member of non-metallic material at least partly surrounding the barrelfor a greater extent than of the circumference thereof and spaced outward therefrom, and a plurality of longitudinal strips of heat resisting material of low thermal conductivity interposed between and engaging the said barrel and the said barrel engaging member, said strips being arranged around the barrel for a greater extent than 180 of the circumference thereof to interlock the barrel and the barrel engaging member.

3. In a firearm, the combination of a barrel, a barrel engaging member of non-metallic material at least partly surrounding the barrel fora greater extent than 180 of the circumference thereof and spaced outward therefrom and having a plurality of spaced grooves in the inner face thereof, and a plurality of strips of heat resisting material of low thermal conductivity fitting the said grooves and engaging the said barrel, said strips being arranged around the barrel for a greater extent than 180 of the circumference thereof to interlock the barrel and the barrel engaging member.

4. In a firearm, the combination of a barrel, a barrel engaging member of non-metallic material at least partly surrounding the barrel for a greater extent than 180 of the circumference thereof and spaced outward therefrom and having a, plurality of circumferentially spaced longitudinal grooves in the inner face thereof, and a plurality of longitudinal strips of heat resisting material of low thermal conductivity fitting the said grooves and engaging the said barrel, said strips being arranged around the barrel fora greater extent than 180 of the circumference thereof to interlock the barrel and the barrel engaging member.

5. In a firearm, the combination of a barrel, a barrel engaging member molded from a material of the synthetic resin class and at least partly surrounding the barrel and spaced outward therefrom, and a plurality of spaced strips of asbestos interposed between and engaging the said barrel and the said barrel engaging member.

6. In a firearm, the combination of a barrel, a barrel engaging member molded from a material of the synthetic resin class and at least partly surrounding the barrel and spaced outward therefrom and having a plurality of spaced grooves molded in the inner face thereof, and a plurality of strips of asbestos fitting the said grooves and engaging the said barrel.

7. In a firearm, the combination of a barrel, a barrel engaging member molded from a material of the synthetic resin class and at least partly surrounding the barrel and spaced outward therefrom and having a plurality of circumferentially spaced longitudinal grooves molded in the inner face thereof, and a plurality of longitudinal strips of asbestos fitting the said grooves and engaging the said barrel.

8. For a firearm, a forearm molded from material of the synthetic resin class and adapted to at least partly surround the barrel and having a plurality of spaced grooves in its inner face adapted to receive strips of material to be interposed between the barrel and the forearm.

9. For a firearm, a forearm molded from a material of the synthetic resin class and adapted to at least partly surround the barrel and having a plurality of spaced rooves molded in its inner face and adapted to receive strips of material to be interposed between the barrel and the forearm, said grooves extending longitudinally of the forearm.

- BENJAMIN F. CONNER'.