# US 2023/0054559 A1 · Utility knife > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0054559 A1 - Document ID: US20230054559A1 - Status: Published application - Kind: A1 - Application number: 17/697,053 - Filed: 2022-03-17 - Published: 2023-02-23 - Earliest claimed: 2021-08-17 - Assignees: Hong Ann Tool Industries Co., Ltd. - Applicants: Hong Ann Tool Industries Co., Ltd. - Inventors: Cheng-Wei SU - Web page: https://patentgrep.com/patent/US20230054559A1 ## CPC - B26B 5/001: {with blades being slid out of handle immediately prior to use} - B26B 1/08: with sliding blade {(with detachable blades B26B5/001)} - 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 An utility knife includes a housing, a blade seat, a blade, and a switching assembly. The housing has a chamber, an opening formed at an end of the chamber, and a switch slot communicating with the chamber. The blade seat is arranged in the chamber and has a blade holding slot and a guiding slot communicating with the blade holding slot. The blade is detachably mounted to the blade holding slot and has at least one engaging slot. The switching assembly includes a toggle switch movably arranged to the switch slot and exposed to the housing, an engaging block disposed at an end of the toggle switch and movably arranged to the guiding slot, and a biasing member elastically biasing the engaging block relative to the guiding slot. ## Claims ### Claim 1 An utility knife comprising: a housing having a chamber, an opening formed at an end of the chamber, and a switch slot communicating with the chamber; a blade seat arranged in the chamber and having a blade holding slot and a guiding slot communicating with the blade holding slot; a blade detachably mounted to the blade holding slot and having at least one engaging slot; and a switching assembly including a toggle switch movably arranged to the switch slot and exposed to the housing, an engaging block disposed at an end of the toggle switch and movably arranged to the guiding slot, and a biasing member elastically biasing the engaging block relative to the guiding slot, and wherein the toggle switch is configured to drive the engaging block to move relative to the guiding slot, so that the engaging block is detachably engaged with the at least one engaging slot of the blade. ### Claim 2 (depends on 1) The utility knife as claimed in claim 1, wherein the engaging block has an engaging portion detachably engaged with the at least one engaging slot, and an abutted portion constantly abutted by the biasing member, and wherein the engaging portion forms an inclined surface detachably abutting against the blade. ### Claim 3 (depends on 2) The utility knife as claimed in claim 2, wherein an inner wall surface of the guiding slot is extended to form a stopping portion configured to selectively stop the engaging portion as the engaging block moves relative to the guiding slot. ### Claim 4 (depends on 2) The utility knife as claimed in claim 2, wherein the toggle switch has a toggle portion exposed to the housing and a driving portion extending from the toggle portion, and wherein the driving portion is configured to connect with the engaging portion to drive the engaging block to move relative to the guiding slot. ### Claim 5 (depends on 2) The utility knife as claimed in claim 2, wherein the biasing member is a spring plate and has a fixing end connected to the blade seat and an abutting end abutting against the abutted portion of the engaging block, and wherein the abutting end is configured to restorably pivot relative to the fixing end as the engaging block moves relative to the guiding slot. ### Claim 6 (depends on 5) The utility knife as claimed in claim 5, wherein the housing further has a button slot communicating with the chamber, wherein the blade seat is movably arranged in the chamber, wherein the utility knife further comprises: a slide button movably arranged to the button slot and connected to the blade seat to drive the blade seat to move relative to the chamber, and wherein the blade is selectively exposed to the opening as the blade seat moves relative to the chamber. ### Claim 7 (depends on 6) The utility knife as claimed in claim 6, wherein the blade seat has a proximal end adjacent to the opening and a distal end opposite to the proximal end, wherein the blade holding slot extends from the proximal end to the distal end along a length direction, wherein the guiding slot is disposed between the proximal end and the distal end and extends along a height direction perpendicular to the length direction to communicate with the blade holding slot, and wherein the fixing end of the biasing member is connected to the distal end. ### Claim 8 (depends on 7) The utility knife as claimed in claim 7, wherein the button slot is sequentially provided with at least two limiting portions along the length direction, wherein the blade seat is provided with an extension portion extending along the length direction, wherein the extension portion has a holding end fixed to the proximal end and a limiting end opposite to the holding end, wherein the slide button is connected between the holding end and the limiting end and is adjacent to the limiting end, wherein the slide button is configured to drive the limiting end to pivot relative to the holding end, so that the limiting end is configured to pivot relative to the holding end so as to detachably abut against one of the at least two limiting portions of the button slot. ### Claim 9 (depends on 7) The utility knife as claimed in claim 7, wherein the slide button is configured to detachably abut against the biasing member when the limiting end pivots relative to the holding end.