# US 11,079,188 B2 · Firearm > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,079,188 B2 - Document ID: US11079188B2 - Status: Granted - Kind: B2 - Application number: 16/767,033 - Filed: 2018-09-26 - Published: 2021-02-04 - Granted: 2021-08-03 - Earliest claimed: 2017-12-29 - Assignees: Caesar Guerini S.R.L. - Applicants: Caesar Guerini S.R.L. - Inventors: Antonio Guerini - Web page: https://patentgrep.com/patent/US11079188B2 ## CPC - F41A 3/58: Breakdown breech mechanisms, e.g. for shotguns - F41C 7/11: Breakdown shotguns or rifles (hinge-frame revolvers F41C3/16; breech mechanisms therefor F41A3/58; cocking mechanisms therefor F41A19/41) - F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE - F41C: SMALLARMS, e.g. PISTOLS, RIFLES (functional features or details common to both smallarms and ordnance, mountings therefor F41A; projecting missiles without use of explosive or combustible propellant charge F41B); ACCESSORIES THEREFOR ## Abstract A firearm (1) comprising a firearm frame (2) which delimits at least one first friction surface (6, 6′); one barrel (4, 4′), mounted to said frame (2) in a rotatable manner (A1) between opening and closing configurations and comprising an abutment appendix (8); and an adjustment device (10). Such a device comprises: 1) a second friction surface (12) placed in a sliding contact with the first friction surface (6, 6′) to oppose a resistance to the rotation of the barrel (4, 4′) between the configurations; ii) a contact surface (14) with the abutment appendix (8); iii) an adjustment member (16), longitudinally movable (LI, L2) for modifying a relative distance between the second friction surface (12) and the contact surface (14), thereby adjusting the sliding friction between said friction surfaces (6, 6′, 12); and iv) a maneuvering element (18) rotatable in discrete adjustment positions, interacting with the adjustment member (16) to move it by a constant pitch at each angularly adjacent adjustment position. ## Claims ### Claim 1 An adjustment device (10) for a firearm (1), wherein said firearm (1) comprises: a first support portion (2) delimiting at least one first friction surface (6, 6′); and at least one barrel (4, 4′), mounted to said support portion (2) in a rotatable manner (A1) between opening and closing configurations and comprising an abutment appendix (8); and wherein said adjustment device (10) comprises: i) at least a second friction surface (12) configured to be placed in a sliding contact with the first friction surface (6, 6′) to oppose a resistance to the rotation of the barrel (4, 4′) between said configurations; ii) a contact surface (14) with the abutment appendix (8); iii) an adjustment member (16), movable longitudinally (L1, L2) to modify a relative distance between the second friction surface (12) and the contact surface (14), thereby adjusting the sliding friction between said friction surfaces (6, 6′, 12), and therefore said resistance; iv) a maneuvering element (18) rotatable in discrete adjustment positions, interacting with the adjustment member (16) to move it by a constant pitch at each angularly adjacent adjustment position. ### Claim 2 (depends on 1) The adjustment device (10) according to claim 1, wherein the maneuvering element (18) interacts with the adjustment member (16) through a cam surface or a cam profile (20) of the maneuvering element (18), which extends around the rotation axis (A2) of said element (18) with a plurality of mutually different curvature radii (R1-R6), which are eccentric and tangential to each other. ### Claim 3 (depends on 2) The adjustment device (10) according to claim 2, wherein the curvature radii (R1-R6) increase progressively in a direction of rotation (V1) of the maneuvering element (18) which is capable of increasing the resistance to the rotation of the barrel (4, 4′), and/or wherein the curvature radii (R1-R6) decrease progressively in a direction of rotation (V2) of the maneuvering element (18) capable of reducing the resistance to rotation of the barrel (4, 4′). ### Claim 4 (depends on 1) The adjustment device (10) according to claim 1, wherein the maneuvering element (18) has an irreversible rotation, i.e. not mutable reversibly by the opposing forces exerted by the adjustment member (16) in normal use conditions of said firearm (1). ### Claim 5 (depends on 1) The adjustment device (10) according to claim 1, wherein the constant pitch is 0.01-0.1 mm, and/or wherein the maximum longitudinal movement of the adjustment member (16) between limit adjustment positions is equal to or smaller than 5.0 mm. ### Claim 6 (depends on 1) The adjustment device (10) according to claim 1, wherein the adjustment positions are angularly equidistant around the maneuvering element (18). ### Claim 7 (depends on 1) The adjustment device (10) according to claim 1, wherein the adjustment device (10) comprises locking means (22) of the maneuvering element (18) in the discrete adjustment positions, said means (22) being of the reversible snap-action type. ### Claim 8 (depends on 7) The adjustment device (10) according to claim 7 comprising a device body (24) which delimits an element seat (26) for at least partial housing of the maneuvering element (18), and comprising a locking element (28) of the locking means (22) received partly in the device body (24) and constantly forced towards the element seat (26) so as to intercept an adjustment periphery (28) of the maneuvering element (18). ### Claim 9 (depends on 8) The adjustment device (10) according to claim 8, wherein a transverse section—with respect to the rotation axis (A2) of the maneuvering element (18)—of the adjustment periphery (28) is shaped with alternating ridges (30) and depressions (32), where the locking element (28) is configured to engage said depressions (32) in each adjustment position being constantly forced in abutment against the adjustment periphery (28) by elastic means (34) of the adjustment device (10). ### Claim 10 (depends on 1) The adjustment device (10) according claim 1, wherein the adjustment member (16) delimits the contact surface (14) in an optionally frontal position, and wherein the maneuvering element (18) is movable longitudinally (L1, L2) with the second friction surface (12) so as to exert a lower or greater pressure on the first friction surface (6, 6′). ### Claim 11 (depends on 1) The adjustment device (10) according to claim 1, wherein the adjustment member (16) and the maneuvering element (18) are geometrically coupled, the adjustment member (16) comprising a pair of lateral arms (36, 38) which delimit a guide space (40) between them wherein is housed at least part of the cam surface or cam profile (20) of the maneuvering element (18), for example made radially in undercut. ### Claim 12 (depends on 1) The adjustment device (10) according to claim 1, wherein the maneuvering element (18) comprises an element head (42) counter-shaped with an adjustment tool, for example with a polygonal section, in order to move said element (18) in the discrete adjustment positions. ### Claim 13 A firearm (1) comprising: a first support portion (2) delimiting at least one first friction surface (6, 6′); least two side-by-side or superimposed barrels (4, 4′), mounted to said first support portion (2) in a rotatable manner (A1) between opening and closing configurations and comprising an abutment appendix (8); and an adjustment device (10) comprising: i) at least a second friction surface (12) configured to be placed in a sliding contact with the first friction surface (6, 6′) to oppose a resistance to the rotation of the barrel (4, 4′) between said configurations; ii) a contact surface (14) with the abutment appendix (8); iii) an adjustment member (16), movable longitudinally (L1, L2) to modify a relative distance between the second friction surface (12) and the contact surface (14), thereby adjusting the sliding friction between said friction surfaces (6, 6′, 12), and therefore said resistance; iv) a maneuvering element (18) rotatable in discrete adjustment positions, interacting with the adjustment member (16) to move it by a constant pitch at each angularly adjacent adjustment position.