Patent US4689330A successfully refreshed from Google Patents.
US3731418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Small firearms with exchangeable barrel
Assignee: JP Sauer and Sohn Machinenbau GmbH
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Filing: 1971-03-22
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Granted: 1973-05-08
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Expires: 1991-03-22
Abstract
Abstract An apparatus for detachably securing a firearm barrel with a receiver flange of a receiver assembly and characterized in that the receiver flange is longitudinally slit so as to permit the flange to be circumferentially constricted into clamping engagement with the barrel.
Inventors
- 👤 M Birkenhagen
- 👤 M Birkenaen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:08
CPC Classifications
F; F41; F41A; F41A21/00; F41A21/48; F41A21/487; F41A21/481; F41A21/482
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
113 words
A firearm including exchangeable barrel means and comprising: receiver flange means including barrel receiving socket means for receiving a terminal end portion of said barrel means, support means disposed generally beneath said socket means, and longitudinal slit means formed in said support means and operable to permit circumferential contraction of said barrel receiving socket means; said support means being operable to be connected with firearm stock means; and clamping means carried by said support means and operable to engage said flange means on opposite sides of said slit means, induce convergence of said opposite sides of said slit means, and cause circumferential contraction of said barrel receiving socket means of said flange means.
Claim 2
Dependent Claim
113 words
A firearm including exchangeable barrel means and comprising: receiver flange means including barrel receiving socket means for receiving a terminal end portion of said barrel means, support means disposed generally beneath said socket means, and longitudinal slit means formed in said support means and operable to permit circumferential contraction of said barrel receiving socket means; said support means being operable to be connected with firearm stock means; and clamping means carried by said support means and operable to engage said flange means on opposite sides of said slit means, induce convergence of said opposite sides of said slit means, and cause circumferential contraction of said barrel receiving socket means of said flange means.
Claim 3
Dependent Claim
87 words
A firearm as described in claim 1 further including: restraining means engaging outermost portions of said opposite sides of said slit means, said restraining means being operable to restrain convergence of said outermost portions of said opposite sides of said slit means and thereby cause said clamping means to induce convergence of inner portions of said sides of said slit means so as to produce circumferential contraction of said barrel receiving socket means without imposing substantial barrel flattening forces on barrel means received in said socket means.
Claim 4
Dependent Claim
62 words
A firearm as described in claim 2 wherein: said restraining means comprises connecting means operable to interconnect said support means with a firearm stock means; and said restraining means further comprises screw means threadably engaging said opposite sides of said slit means, with said screw means extending along an axis which is generally perpendicular to a longitudinal axis of said barrel means.
Claim 5
Dependent Claim
78 words
A firearm as described in claim 2 wherein: said slit means has a generally T-shaped cross sectional configuration, extending transversely of the longitudinal axis of said barrel means; and said restraining means comprises: block means having a generally T-shaped cross section slidably disposed in said slit means for sliding movement longitudinally of said barrel means, and threaded securing means threadably mounted in said block means and operable to abuttingly engage generally downwardly facing surfaces of said slit means.
Claim 6
Dependent Claim
95 words
A firearm as described in claim 1 further including: first, aligning recess means formed on the outer periphery of said barrel means; second, aligning recess means formed in said support means; alignment securing means operable to extend through each of said first and second recess means and thereby secure said barrel means in a predetermined position relative to said flange means; block means slidably carried by said support means; and restraining means carried by said block means and operable to abuttingly engage and secure said alignment securing means in said first and second recess means.
Claim 7
Dependent Claim
45 words
A firearm as described in claim 1 further comprising: bayonet-type locking lug means detachably interconnecting said barrel means and said Flange means; and stop means carried by said flange means and operable to maintain said bayonet-type locking lug means in a barrel means securing position.
Claim 8
Dependent Claim
69 words
A firearm as described in claim 1 further comprising: first threaded surface means carried by said flange means; and second threaded surface means carried by said barrel means and operable to threadably engage said first threaded surface means; said clamping means being operable to intersect said threadably engaged first and second threaded surface means and thereby maintain said first and second threaded surface means in a predetermined axial relationship.
Claim 9
Dependent Claim
89 words
A firearm as described in claim 1 wherein said clamping means comprises: lever means pivotally connected with said receiver flange means; rotary cam means carried by said lever means; and cam follower means carried by constrictable portions of said support means disposed laterally adjacent said slit means; said cam means of said lever means being operable to cammingly cooperate with said cam follower means to induce barrel means clamping constriction of said barrel receiving socket means in response to pivotal movement of said lever means toward said barrel means.
Claim 10
Dependent Claim
61 words
A firearm as described in claim 8 wherein: said lever means comprises: mounting eyes disposed on opposite lateral sides of said support means; said clamping means comprises bolt means transversely intersecting said slit means and providing rotatable support for said eye means; and said rotary cam means comprises a pair of rotary cams each supported by one of said eye means.
Claim 11
Dependent Claim
35 words
A firearm as described in claim 9 wherein said rotary cam means comprises a pair of generally helical cam surface means disposed on opposite sides of said support means and generally facing said slit means.
Claim 12
Dependent Claim
84 words
A firearm as described in claim 10 wherein: said slit means has a generally T-shaped cross sectional configuration, extending transversely of the longitudinal axis of said barrel means; and restraining means being carried by said support means and comprising: block means having a generally T-shaped cross section slidably disposed in said slit means for sliding movement longitudinally of said barrel means, and threaded securing means threadably mounted in said block means and operable to abuttingly engage generally downwardly facing surfaces of said slit means.
Claim 13
Dependent Claim
32 words
A firearm according to claim 1 wherein said receiver flange means further includes: means, in addition to said clamping means, for resisting axial displacement of said barrel means from said socket means.
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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |