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US3657959A Expired / Lapsed US ⏱️ 0.0 years remaining

Automatic pistol and sub-caliber conversion therefor

Assignee: Individual
•
Filing: 1969-08-14
•
Granted: 1972-04-25
•
Expires: 1989-08-14
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Abstract

Abstract The invention provides a conversion means for converting a large caliber automatic pistol to an accurate sub-caliber automatic pistol without making any exterior changes in the large caliber pistol. In the prior art the well-known Colt automatic pistol, caliber .45, Government model, can be converted to a sub-caliber automatic pistol by means of a conversion kit which includes a different slide, a different barrel, a different recoil spring, a different slide-stop, and a series of spacers to surround the recoil spring guide to shorten the recoil movement. To improve the accuracy of such converter large caliber automatic pistol the present invention makes the following changes in certain of the conversion parts. The smaller caliber barrel is provided at its rearward end with aligned cheeks for engagement with the upper surface of the receiver; a flattened surface is provided on one lateral face of such smaller caliber barrel including one of said cheeks to facilitate insertion of such barrel within the pistol slide; an elongated hole inclined upwardly at an angle of 45* is provided in the barrel extension member which receives the slide-stop pin; a screw-threaded hole is provided in the front face of the barrel extension member for receiving a barrel locking screw which extends through the recoil spring guide; the barrel locking screw engages the front end of the recoil spring guide and upon tightening of said screw brings the barrel cheeks and upper surface of the receiver into firm engagement; and the slide stop is provided with a relatively movable bar and pin.

Inventors

  • 👤 Frederick H Kart

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 18:31
CPC Classifications
F; F41; F41A; F41A21/00; F41A21/10; F41A11/00; F41A11/02

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 151 words
An automatic pistol having a receiver, a slide, a barrel for recoiling movement relative to said receiver and slide, spring means yieldingly resisting said recoiling movement, said receiver and slide having interfitting grooves and flanges, said receiver having an upper surface above said interfitting grooves and flanges on each side of said barrel which parallels the axis of said barrel, and conversion means for converting said pistol from a large caliber bore to a smaller caliber bore, characterized in that said conversion means comprise a. a small caliber bore Barrel having on each exterior side wall adjacent its rearward end a cheek extending forwardly from said rearward end, parallel to the axis of said barrel, each cheek having a lower surface adapted for engagement with one of said upper surfaces of said receiver, and b. means for firmly engaging said cheeks and the upper surfaces of said receiver at all times.
Claim 2
Dependent Claim 151 words
An automatic pistol having a receiver, a slide, a barrel for recoiling movement relative to said receiver and slide, spring means yieldingly resisting said recoiling movement, said receiver and slide having interfitting grooves and flanges, said receiver having an upper surface above said interfitting grooves and flanges on each side of said barrel which parallels the axis of said barrel, and conversion means for converting said pistol from a large caliber bore to a smaller caliber bore, characterized in that said conversion means comprise a. a small caliber bore Barrel having on each exterior side wall adjacent its rearward end a cheek extending forwardly from said rearward end, parallel to the axis of said barrel, each cheek having a lower surface adapted for engagement with one of said upper surfaces of said receiver, and b. means for firmly engaging said cheeks and the upper surfaces of said receiver at all times.
Claim 3
Dependent Claim 43 words
An automatic pistol according to claim 1, wherein said small caliber bore barrel has one of its lateral faces including one of said cheeks flattened so as to permit said small caliber bore barrel to be inserted in the slide from its underside.
Claim 4
Dependent Claim 161 words
An automatic pistol according to claim 1, in which the barrel has a downwardly projecting extension member, a recoil spring guide, a coil spring surrounding said guide, and a plurality of spacers surrounding said spring guide adjacent said extension member and serving to limit the recoil movement of the slide to accommodate to a smaller caliber bullet, further characterized in that said conversion means also comprise c. a screwthreaded hole in the front face of said barrel extension member, d. a barrel locking screw disposed within said spring guide and having a head engaging the front end of said spring guide, said screw being in threaded engagement with the hole in the front face of said barrel extension member, and e. a slide-stop pin disposed in an elongated, upwardly-inclined slot in said barrel extension member, whereby upon tightening of said barrel locking screw the cheeks on the conversion barrel are forced into firm engagement with the upper surface of the receiver.
Claim 5
Dependent Claim 48 words
An automatic pistol according to claim 3, wherein f. the elongated, upwardly-inclined slot is disposed at an angle of approximately 45* to the longitudinal axis of the barrel, and g. the slide-stop has a relatively movable bar and pin with the pin mounted in the elongated, upwardly-inclined slot.
Claim 6
Dependent Claim 68 words
An automatic pistol according to claim 4, wherein the slide-stop comprises a pin member with a reduced end having a screwthreaded hole therein, a bar having a bearing hole at one end for receiving the reduced end of the pin, and a screw for engagement through the hole in the bar with the screwthreaded hole in the pin, whereby relative movement between the pin and bar is permitted.

References Cited (Backward Citations)

US1563675A Cited
US1719384A Cited
US2776602A Cited
US3504594A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-04-25 1975-10-25 1976-04-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-04-25 1979-10-25 1980-04-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-04-25 1983-10-25 1984-04-25 $7700.00 Window Closed / Lapsed

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