# US 8,740,311 B2 · Cutting apparatus for concrete or the like > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,740,311 B2 - Document ID: US8740311B2 - Status: Granted - Kind: B2 - Application number: 13/365,681 - Filed: 2012-02-03 - Published: 2012-08-09 - Granted: 2014-06-03 - Earliest claimed: 2011-02-08 - Assignees: Mikasa Sangyo Co., Ltd. - Applicants: Kenichi Nagasawa - Inventors: Kenichi Nagasawa - Web page: https://patentgrep.com/patent/US8740311B2 ## CPC - B28D 1/045: {Sawing grooves in walls; sawing stones from rocks; sawing machines movable on the stones to be cut} - B28D 7/02: for removing or laying dust, e.g. by spraying liquids; for cooling work - E01C 23/0933: {rotary, e.g. circular-saw joint cutters} - E01C 2301/50: Methods or devices for preventing dust by spraying or sucking - B28D: WORKING STONE OR STONE-LIKE MATERIALS - E01C: CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR (forming roads or like surfaces by compacting or grading snow or ice E01H) ## Abstract A cutting apparatus has a main body including a body frame, wheels, a motor and a blade; a blade cover; and a slide guide. A cutting depth of the blade is adjustable. A blade cover casing entirely covers the blade. A slider having left and right linear portions is attached to a rear surface of the casing. The slide guide has circular-arc portions and flaps for sandwiching the linear portions of the slider. A gap is formed between the flaps and a side surface of the body frame. By sandwiching the linear portions of the slider between a flap and the body frame, and sandwiching the circular-arc portions between the left and right linear portions, the blade cover can slide in the up-down direction with respect to the slide guide and the body frame and can rotate about the circular-arc portions. ## Claims ### Claim 1 A cutting apparatus for concrete or the like, comprising: a main body; a blade cover; and a slide guide, wherein: the main body includes a body frame, wheels, a motor, and a blade, and is configured so that a cutting depth of the blade during a cutting operation is adjustable by changing a tilting angle of the body frame in a front-rear direction and a height of a front portion of the body frame; the blade cover includes a box-shaped casing having a size such that the blade can be entirely covered, and a slider attached to a rear surface of the casing; the casing is open at a bottom surface side, and has a notch for receiving a rotating shaft of the blade formed in the rear surface of the casing from a lower edge upward to a predetermined height position; the slider has left and right linear portions of a predetermined length and is attached so that both of the linear portions are oriented to be on an inner side and parallel to each other and also so that a predetermined gap is formed between a portion of a predetermined range including at least the linear portions and the rear surface of the casing; the slide guide includes left and right circular-arc portions and flaps for sandwiching the linear portions of the slider; the left and right circular-arc portions are disposed at a side surface of the body frame in a mutual arrangement so as to face one another in a front-rear direction of the body frame, with a rotating shaft that supports the blade being inserted therebetween; each flap is attached so that a predetermined gap is formed between said flap and the side surface of the body frame; and by sandwiching the linear portions of the slider between the flaps of the slide guide and the body frame and sandwiching the circular-arc portions between the left and right linear portions, the blade cover is held in a state in which the blade cover can slide in the up-down direction with respect to the slide guide and the body frame and can rotate about the circular-arc portions. ### Claim 2 (depends on 1) The cutting apparatus for concrete or the like according to claim 1, wherein the left and right circular-arc portions are curved along a single virtual circle. ### Claim 3 (depends on 1) The cutting apparatus for concrete or the like according to claim 1, wherein the slider is attached to the rear surface of the casing, with a vibration-damping rubber bushing being interposed therebetween, and the entire slider is fixed at a position separated from the casing. ### Claim 4 (depends on 1) The cutting apparatus for concrete or the like according to claim 1, wherein an upper half of the blade cover is formed in a semicircular shape, and a base end portion of a dust flow channel formed inside the casing is open along an ejection direction of dust generated during the cutting operation. ### Claim 5 (depends on 1) The cutting apparatus for concrete or the like according to claim 1, wherein a dust guide is attached at a position such that part of the bottom surface of the blade cover is covered from below, so that a rear side can rotate, with a front side serving as a base point, and in a state such that the rear side is impelled downward. ### Claim 6 (depends on 1) The cutting apparatus for concrete or the like according to claim 1, wherein a stopper that restricts at a certain height position a downward movement of the blade cover attached to the slide guide is attached to the rear surface of the casing. ### Claim 7 (depends on 2) The cutting apparatus for concrete or the like according to claim 2, wherein the slider is attached to the rear surface of the casing, with a vibration-damping rubber bushing being interposed therebetween, and the entire slider is fixed at a position separated from the casing. ### Claim 8 (depends on 2) The cutting apparatus for concrete or the like according to claim 2, wherein an upper half of the blade cover is formed in a semicircular shape, and a base end portion of a dust flow channel formed inside the casing is open along an ejection direction of dust generated during the cutting operation. ### Claim 9 (depends on 3) The cutting apparatus for concrete or the like according to claim 3, wherein an upper half of the blade cover is formed in a semicircular shape, and a base end portion of a dust flow channel formed inside the casing is open along an ejection direction of dust generated during the cutting operation. ### Claim 10 (depends on 2) The cutting apparatus for concrete or the like according to claim 2, wherein a dust guide is attached at a position such that part of the bottom surface of the blade cover is covered from below, so that a rear side can rotate, with a front side serving as a base point, and in a state such that the rear side is impelled downward. ### Claim 11 (depends on 3) The cutting apparatus for concrete or the like according to claim 3, wherein a dust guide is attached at a position such that part of the bottom surface of the blade cover is covered from below, so that a rear side can rotate, with a front side serving as a base point, and in a state such that the rear side is impelled downward. ### Claim 12 (depends on 4) The cutting apparatus for concrete or the like according to claim 4, wherein a dust guide is attached at a position such that part of the bottom surface of the blade cover is covered from below, so that a rear side can rotate, with a front side serving as a base point, and in a state such that the rear side is impelled downward. ### Claim 13 (depends on 2) The cutting apparatus for concrete or the like according to claim 2, wherein a stopper that restricts at a certain height position a downward movement of the blade cover attached to the slide guide is attached to the rear surface of the casing. ### Claim 14 (depends on 3) The cutting apparatus for concrete or the like according to claim 3, wherein a stopper that restricts at a certain height position a downward movement of the blade cover attached to the slide guide is attached to the rear surface of the casing. ### Claim 15 (depends on 4) The cutting apparatus for concrete or the like according to claim 4, wherein a stopper that restricts at a certain height position a downward movement of the blade cover attached to the slide guide is attached to the rear surface of the casing.