# US 12,759,174 B2 · Foldable knife > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,759,174 B2 - Document ID: US12759174B2 - Status: Granted - Kind: B2 - Application number: 19/060,609 - Filed: 2025-02-21 - Published: 2026-08-27 - Granted: 2026-10-13 - Earliest claimed: 2025-02-21 - Assignees: Yangjiang Yangdong Jiashuo Metal Products Factory - Applicants: Yangjiang Yangdong Jiashuo Metal Products Factory - Inventors: Xingsheng Lu - Web page: https://patentgrep.com/patent/US12759174B2 ## CPC - B26B 1/10: Handles - B26B: HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR (for harvesting A01D; for horticulture, for forestry A01G; for butchering or meat treatment A22; for manufactering or repairing footwear A43D; nail clippers or cutters A45D29/02; kitchen equipment A47J; {vegetable slicers, julienne cutters and similar devices and holders therefor, B26D3/28}; for surgical purposes A61B; for metal B23D; cutting by abrasive fluid jets B24C5/02; plier-like tools with cutting edges B25B7/22; pincers B25C11/02; handles for hand implements, in general B25G; guillotine-type cutters B26D; {perforating by non-mechanical means, e.g. by fluid jet, B26F1/26}; for erasing B43L19/00; for textile materials D06H) ## Abstract A foldable knife includes a left knife handle and a right knife handle provided opposite to each other, a blade, and two rotating rods. The rear end of the left knife handle is rotatably connected to the rear end of the right knife handle, so that respective front ends of the two knife handles can rotate towards and away from each other, opposite sides of the two knife handles are provided with knife grooves, respective ends of the two rotating rods are respectively rotatably connected to the rear end of the blade, and the other ends of the two rotating rods are respectively rotatably connected in the knife grooves of the knife handles on the corresponding sides, the two knife handles will be rotated to push the two rotating rods to rotate and drive the blade to be in an open state and to be in a closed state. ## Claims ### Claim 1 A foldable knife, comprising a left knife handle (1) and a right knife handle (2) provided opposite to each other, a blade (3), and two rotating rods (4), wherein a rear end of the left knife handle (1) is rotatably connected to a rear end of the right knife handle (2), so that respective front ends of the two knife handles can rotate towards and away from each other, opposite sides of the two knife handles are provided with knife grooves (10), respective ends of the two rotating rods (4) are respectively rotatably connected to the rear end of the blade (3), and the other ends of the two rotating rods (4) are respectively rotatably connected in the knife grooves (10) of the knife handles on the corresponding sides, the two knife handles will be rotated to push the two rotating rods to rotate and drive the blade (3) to extend out of the front ends of the two knife handles to be in an open state and received between two knife grooves to be in a closed state; wherein the foldable knife further comprises a reset part (5) for automatically pushing the left knife handle (1) and the right knife handle (2) to rotate towards each other; and wherein the rear end of the right knife handle (2) is rotatably connected to the rear end of the left knife handle (1) via a rotating shaft (6), the reset part (5) is a torsion spring sleeved on the outside of the rotating shaft (6), and two legs of the torsion spring respectively abut against the left knife handle (1) and the right knife handle (2). ### Claim 2 (depends on 1) The foldable knife according to claim 1, wherein two of the rotating rods (4) are provided with a plurality of teeth (40) in a circumferential direction corresponding to an edge side of the end connected with the blade (3), and the teeth (40) of the two rotating rods (4) are engaged with each other. ### Claim 3 (depends on 2) The foldable knife according to claim 2, wherein the left knife handle (1) comprises a left upper handle piece (11) and a left lower handle piece (12) which are provided opposite to each other, the right knife handle (2) comprises a right upper handle piece (21) and a right lower handle piece (22) which are provided opposite to each other, a gap is provided between the upper handle piece and the lower handle piece to form a knife groove (10), a rotating shaft (6) is provided at a position of the rear end between the left upper handle piece (11) and the left lower handle piece (12), a connecting block (8) is provided inside the rear end of the right upper handle piece (21) and the right lower handle piece (22), the connecting block (8) is provided with a through hole (81), and the through hole (81) of the connecting block (8) is sleeved on the outside of the rotating shaft (6). ### Claim 4 (depends on 3) The foldable knife according to claim 3, wherein the blade (3) comprises a positioning column (9) is-provided at a front end between the left upper handle piece (11) and the left lower handle piece (12) and at a front end between the right upper handle piece (21) and the right lower handle piece (22), a positioning groove (31) is provided at a position corresponding to the positioning column (9) of the blade (3), and when the blade (3) is in the open state, the positioning column (9) cooperates with the positioning groove (31). ### Claim 5 (depends on 3) The foldable knife according to claim 3, wherein the rotating rod (4) comprises an upper rod (41) and a lower rod (42) which are provided opposite to each other, the blade (3) is located between the upper rod (41) and the lower rod (42), the front ends of the upper rod (41) and the lower rod (42) are both rotatably connected to the rear end of the blade (3), the edge sides of the front ends of the upper rod (41) and the lower rod (42) are both provided with a plurality of teeth (40) in the circumferential direction, and the teeth (40) of the two upper rods (41) are engaged with each other, the teeth (40) of the two lower rods (42) are engaged with each other, and a rear end of the upper rod (41) is rotatably connected to an inner side of an upper handle piece of a corresponding side knife handle, and a rear end of the lower rod (42) is rotatably connected to an inner side of the lower handle piece of the corresponding side handle. ### Claim 6 (depends on 5) The foldable knife according to claim 5, wherein the front ends of the upper rod (41) and the lower rod (42) are rotatably connected to the blade (3) via pins (7), and avoidance grooves (111) are provided on respective upper and lower handle pieces corresponding to the positions of the pins (7), and when the blade (3) is in a closed state, the respective pins (7) are placed in the corresponding avoidance grooves (111). ### Claim 7 (depends on 6) The foldable knife according to claim 6, wherein spacers (71) are respectively sleeved on the outside of the pins (7) corresponding to a position between the blade (3) and the upper rod (41) and a position between the blade (3) and the lower rod (42). ### Claim 8 (depends on 1) The foldable knife according to claim 1, wherein the left knife handle (1) comprises a left upper handle piece (11) and a left lower handle piece (12) which are provided opposite to each other, the right knife handle (2) comprises a right upper handle piece (21) and a right lower handle piece (22) which are provided opposite to each other, a gap is provided between the upper handle piece and the lower handle piece to form a knife groove (10), the rotating shaft (6) is provided at a position of the rear end between the left upper handle piece (11) and the left lower handle piece (12), a connecting block (8) is provided inside the rear end of the right upper handle piece (21) and the right lower handle piece (22), the connecting block (8) is provided with a through hole (81), and the through hole (81) of the connecting block (8) is sleeved on the outside of the rotating shaft (6). ### Claim 9 (depends on 8) The foldable knife according to claim 8, wherein the blade (3) comprises a positioning column (9) provided at a front end between the left upper handle piece (11) and the left lower handle piece (12) and at a front end between the right upper handle piece (21) and the right lower handle piece (22), a positioning groove (31) is provided at a position corresponding to the positioning column (9) of the blade (3), and when the blade (3) is in the open state, the positioning column (9) cooperates with the positioning groove (31). ### Claim 10 (depends on 8) The foldable knife according to claim 8, wherein the rotating rod (4) comprises an upper rod (41) and a lower rod (42) which are provided opposite to each other, the blade (3) is located between the upper rod (41) and the lower rod (42), the front ends of the upper rod (41) and the lower rod (42) are both rotatably connected to the rear end of the blade (3), the edge sides of the front ends of the upper rod (41) and the lower rod (42) are both provided with a plurality of teeth (40) in the circumferential direction, and the teeth (40) of the two upper rods (41) are engaged with each other, the teeth (40) of the two lower rods (42) are engaged with each other, and a rear end of the upper rod (41) is rotatably connected to an inner side of an upper handle piece of a corresponding side knife handle, and a rear end of the lower rod (42) is rotatably connected to an inner side of the lower handle piece of the corresponding side handle. ### Claim 11 (depends on 10) The foldable knife according to claim 10, wherein the front ends of the upper rod (41) and the lower rod (42) are rotatably connected to the blade (3) via pins (7), and avoidance grooves (111) are provided on respective upper and lower handle pieces corresponding to the positions of the pins (7), and when the blade (3) is in a closed state, the respective pins (7) are placed in the corresponding avoidance grooves (111). ### Claim 12 (depends on 11) The foldable knife according to claim 11, wherein spacers (71) are respectively sleeved on the outside of the pins (7) corresponding to a position between the blade (3) and the upper rod (41) and a position between the blade (3) and the lower rod (42). ### Claim 13 (depends on 1) The foldable knife according to claim 1, wherein an anti-slip groove (20) is provided outside the left knife handle (1) and the right knife handle (2).