# US 8,739,418 B2 · Engine-driven cutter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,739,418 B2 - Document ID: US8739418B2 - Status: Granted - Kind: B2 - Application number: 13/034,231 - Filed: 2011-02-24 - Published: 2011-09-08 - Granted: 2014-06-03 - Earliest claimed: 2010-03-03 - Assignees: Makita Corporation - Applicants: Masayoshi Okumi; Masaki Kondo; Tomonobu Nashimoto - Inventors: Masayoshi Okumi; Masaki Kondo; Tomonobu Nashimoto - Web page: https://patentgrep.com/patent/US8739418B2 ## CPC - B23D 45/16: Hand-held sawing devices with circular saw blades - F02B 63/02: for hand-held tools - F02M 35/1017: {Small engines, e.g. for handheld tools, or model engines; Single cylinder engines} - Y10T 83/9377: Mounting of tool about rod-type shaft - Y10T 83/9457: Joint or connection - Y10T 83/9464: For rotary tool - B23D: PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR (making toothed gears or the like B23F; cutting metal by applying heat locally B23K; arrangements for copying or controlling B23Q) - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A handheld engine-driven cutter is provided with a disk blade and a four-stroke engine that drives the disk blade, a filter through which air provided to the four-stroke engine passes, a carburetor that mixes fuel and the air that passed through the filter, a casing that houses the filter and the carburetor, and a filter bracket intervened between the filter and the carburetor, which guides the air having passed the filter to the carburetor. An oil separator is formed integrally with the filter bracket that protrudes out toward the carburetor. ## Claims ### Claim 1 A handheld engine-driven cutter comprising: a disk blade; a four-stroke engine that drives the disk blade; a filter through which air provided to the four-stroke engine passes; a carburetor that mixes fuel and the air that passed through the filter; and a casing that houses the filter and the carburetor; and a filter bracket intervened between the filter and the carburetor, the filter bracket guides the air having passed the filter to the carburetor, wherein: the filter bracket comprises an opening that is connected to the carburetor and an oil separator that is formed integrally with the filter bracket; the oil separator has a columnar shape that protrudes out from the filter bracket toward a carburetor side in a first direction; and the oil separator is adjacent to the carburetor connected to the opening in a second direction perpendicular to the first direction. ### Claim 2 (depends on 1) A handheld engine-driven cutter as in claim 1, wherein the casing includes a carburetor mount to which the filter bracket is connected with the carburetor intervening therebetween, the carburetor mount composing a part of an outer wall of the casing, a seal member that is made of polymer material and includes a through hole is arranged around a periphery of the carburetor mount, a breathing tube extending from the four-stroke engine is connected with the through hole of the seal member directly or via a joint from an outer side of the casing, and a nipple portion formed on the oil separator is connected with the through hole of the seal member from an inner side of the casing. ### Claim 3 (depends on 2) A handheld engine-driven cutter as in claim 2, wherein the carburetor mount includes a recess portion arranged to face a part of the carburetor. ### Claim 4 (depends on 3) A handheld engine-driven cutter as in claim 3, wherein the recess portion of the carburetor mount faces an arm of the carburetor that opens and closes a throttle valve of the carburetor, and the arm is prevented from making contact with the carburetor mount. ### Claim 5 (depends on 2) A handheld engine-driven cutter as in claim 2, wherein the carburetor mount includes a supporting beam portion protruding towards the carburetor, and the supporting beam portion holds the carburetor at an assembly position upon connecting the filter bracket to the carburetor mount with the carburetor intervening therebetween. ### Claim 6 (depends on 1) A handheld engine-driven cutter as in claim 1, wherein a hose nipple in which at least a distal end thereof extends towards the filter bracket is disposed on an air vent of the carburetor, and the filter bracket includes an air vent connecting opening into which the hose nipple is inserted. ### Claim 7 A handheld engine-driven cutter comprising: a disk blade; a four-stroke engine that drives the disk blade; a filter through which air provided to the four-stroke engine passes; a carburetor that mixes fuel and the air that passed through the filter; a casing that houses the filter and the carburetor; and a filter bracket intervened between the filter and the carburetor, the filter bracket guides the air having passed the filter to the carburetor, wherein: the filter bracket is formed integrally with an oil separator that protrudes out from the filter bracket toward a carburetor side; the casing includes a carburetor mount to which the filter bracket is connected with the carburetor intervening therebetween, the carburetor mount composing a part of an outer wall of the casing; a seal member that is made of polymer material and includes a through hole is arranged around a periphery of the carburetor mount; a breathing tube extending from the four-stroke engine is connected with the through hole of the seal member directly or via a joint from an outer side of the casing; and a nipple portion formed on the oil separator is connected with the through hole of the seal member from an inner side of the casing. ### Claim 8 (depends on 7) A handheld engine-driven cutter as in claim 7, wherein the carburetor mount includes a recess portion arranged to face a part of the carburetor. ### Claim 9 (depends on 8) A handheld engine-driven cutter as in claim 8, wherein the recess portion of the carburetor mount faces an arm of the carburetor that opens and closes a throttle valve of the carburetor, and the arm is prevented from making contact with the carburetor mount. ### Claim 10 (depends on 7) A handheld engine-driven cutter as in claim 7, wherein the carburetor mount includes a supporting beam portion protruding towards the carburetor, and the supporting beam portion holds the carburetor at an assembly position upon connecting the filter bracket to the carburetor mount with the carburetor intervening therebetween. ### Claim 11 A handheld engine-driven cutter comprising: a disk blade; a four-stroke engine that drives the disk blade; a filter through which air provided to the four-stroke engine passes; a carburetor that mixes fuel and the air that passed through the filter; a casing that houses the filter and the carburetor; and a filter bracket intervened between the filter and the carburetor, the filter bracket guides the air having passed the filter to the carburetor, wherein: the filter bracket is formed integrally with an oil separator that protrudes out from the filter bracket toward a carburetor side; a hose nipple in which at least a distal end thereof extends towards the filter bracket is disposed on an air vent of the carburetor; and the filter bracket includes an air vent connecting opening into which the hose nipple is inserted. ### Claim 12 (depends on 1) A handheld engine-driven cutter as in claim 1, wherein the oil separator has a cylindrical shape.