Patent US4109403A successfully refreshed from Google Patents.
US4109403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detachable barrel for hand guns
Assignee: Browning Arms Co
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Filing: 1975-09-25
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Granted: 1978-08-29
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Expires: 1995-09-25
Abstract
Abstract An automatic pistol is constructed with a more or less conventional frame and more or less conventional barrel detachably mounted to the frame. The frame and barrel have interfitting portions in cooperative engagement to support the barrel in longitudinal alignment on the frame. The frame is provided with a seating surface for the bottom of the barrel, an abutment surface against which the breech end of the barrel abuts, and a well, forward of the abutment surface, into which a barrel block loosely fits. The barrel block is attached to depend from the barrel. A longitudinal bore through the barrel block partially registers with a corresponding threaded bore through the frame forward of the barrel block. The forward opening of the bore in the barrel block is countersunk, and the axis of this bore is slightly above the axis of the threaded bore with respect to the axis of the barrel. A screw with a tapered end is threaded through the threaded bore to engage the barrel block bore, thereby urging the barrel down onto the seating surfaces and back toward the abutment surface of the frame.
Inventors
- 👤 Joseph A. Badali
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:54
CPC Classifications
F; F41; F41A; F41A21/00; F41A21/48; F41A21/488; F41A21/484
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
178 words
In a firearm of the type having a frame, a detachable barrel mounted in longitudinal alignment on the frame and means for positively connecting the barrel to the frame, the improvement which comprises: a well in said frame beneath the chamber end of said barrel; a barrel block extending down into said well from attachment to said barrel, said barrel block being in loose fit relation with said well and having a bore in approximately parallel relation with said barrel and countersunk at the forward surface of the barrel block; a threaded bore through the forward surface of the frame in open communication with said well and in approximately parallel alignment with the bore in said barrel block but with its axis lower with respect to said barrel than the axis of the bore in said barrel block; and a barrel screw threaded through said threaded bore with a tapered lead end in engagement with said countersunk portion of the bore in said barrel block, thereby to urge said barrel down and back with respect to said frame.
Claim 2
Dependent Claim
178 words
In a firearm of the type having a frame, a detachable barrel mounted in longitudinal alignment on the frame and means for positively connecting the barrel to the frame, the improvement which comprises: a well in said frame beneath the chamber end of said barrel; a barrel block extending down into said well from attachment to said barrel, said barrel block being in loose fit relation with said well and having a bore in approximately parallel relation with said barrel and countersunk at the forward surface of the barrel block; a threaded bore through the forward surface of the frame in open communication with said well and in approximately parallel alignment with the bore in said barrel block but with its axis lower with respect to said barrel than the axis of the bore in said barrel block; and a barrel screw threaded through said threaded bore with a tapered lead end in engagement with said countersunk portion of the bore in said barrel block, thereby to urge said barrel down and back with respect to said frame.
Claim 3
Dependent Claim
123 words
In an automatic pistol of the type having a frame and a detachable barrel mounted in longitudinal alignment on the frame through interfitting surfaces adapted to retain the bore of the barrel in precise longitudinal alignment with respect to said frame, the improvement which comprises: a shoulder surface on said frame located to constitute means of abutment for a portion of said barrel beneath the chamber thereof; structure depending from said barrel forward of said shoulder surface; and means carried by said frame cooperatively adapted with said depending structure to engage said structure and urge it down and back with respect to the frame thereby to positively secure the barrel to the frame and positively force the barrel back to said shoulder surface.
Claim 4
Dependent Claim
123 words
In an automatic pistol of the type having a frame and a detachable barrel mounted in longitudinal alignment on the frame through interfitting surfaces adapted to retain the bore of the barrel in precise longitudinal alignment with respect to said frame, the improvement which comprises: a shoulder surface on said frame located to constitute means of abutment for a portion of said barrel beneath the chamber thereof; structure depending from said barrel forward of said shoulder surface; and means carried by said frame cooperatively adapted with said depending structure to engage said structure and urge it down and back with respect to the frame thereby to positively secure the barrel to the frame and positively force the barrel back to said shoulder surface.
Claim 5
Dependent Claim
64 words
The improvement of claim 2 wherein the depending structure includes a leg projecting down into a well carried by the frame and having a longitudinal bore with a camming surface at its forward end and the means for securing the barrel to the frame is a threaded screw with a leading end configurated to engage the camming surface of the bore in the leg.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |