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US 10,369,640 B2Granted
Miter saw including a chain drive
AssigneesRobert Bosch Tool Corporation, Robert Bosch GmbH
InventorPlamen V. Marinov
Life of this patent
Estimating the term…
Abstract
A powered saw including a saw blade configured to cut a workpiece and driven by a drive train having a narrow profile. The powered saw includes a miter saw having a chain drive disposed in a housing having a narrow profile. The powered saw includes a blade support assembly configured to reduce or eliminate interference between a workpiece and the powered saw. The miter saw enables a user to make right angle cuts, left angle cuts, and zero cuts of tall and atypically sized workpieces.
Claims13
A power tool comprising:
- a workpiece support structure having a workpiece support surface for supporting a workpiece thereon;
- a motor supported by said workpiece support structure;
- a cutting element configured to perform a cut in a workpiece, said cutting element having a drive input for driving the cutting element to perform the cut, said drive input configured to rotate about a first axis of rotation;
- a drive assembly coupling said motor to said cutting element, including;
- a first drive train extending from said motor to an offset position that is offset from said drive input;
- and
- a second drive train comprising:
- a second driving sprocket connected to said first drive train at the offset position in such a way that the first drive train drives the second driving sprocket about a second axis of rotation;
- a second driven sprocket fixedly coupled to said drive input and configured such that rotation of said second driving sprocket rotates said drive input;
- and
- a second chain engaging said second driving sprocket and said second driven sprocket and configured such that rotation of said second driving pulley or sprocket rotates said second driven sprocket, wherein said first and second drive trains are arranged such that a line connecting said second axis of rotation to said first axis of rotation is perpendicular to said first axis of rotation and arranged in a plane that is perpendicular to said workpiece support surface,
- wherein said cutting element defines a cutting plane, and said drive assembly is arranged entirely on a first side of said cutting plane,
- wherein said cutting plane intersects said motor such that a first portion of said motor is arranged on the first side of the cutting plane, and a second portion of said motor is arranged on a second side of the cutting plane, said first portion having a first length measured parallel to the first axis of rotation and said second portion having a second length measured parallel to the first axis of rotation, and the second length is greater than the first lengthy,
- wherein said drive assembly further comprises a drive housing that defines a first end side of the drive assembly, the drive assembly having a second opposite end side, said first and second drive trains being entirely positioned between said first and second end sides,
- wherein a distance between said first and second end sides measured along a direction parallel to said workpiece support surface and parallel to said first axis of rotation is less than one-third of an overall length of said motor measured along said direction, and
- wherein said second drive train includes a tensioning mechanism engaging said second chain between said second driving sprocket and said second driven sprocket, said tensioning mechanism comprises:
- a tensioning sprocket engaging said second chain and an adjuster configured to position the tensioning sprocket closer to or further away from said second chain so as to adjust a tension of said second chain.
14 more elements
A power tool comprising:
- a workpiece support structure having a workpiece support surface for supporting a workpiece thereon;
- a motor supported by said workpiece support structure;
- a cutting element configured to perform a cut in a workpiece, said cutting element having a drive input for driving the cutting element to perform the cut and being configured to rotate about a first axis of rotation;
- a drive assembly coupling said motor to said cutting element, including;
- a first drive train comprising:
- a first driving pulley coupled to an output of said motor and configured to rotate about a third axis of rotation;
- a first driven pulley configured to rotate about a second axis of rotation at an offset position that is offset from said third axis of rotation;
- and
- a first belt engaged between said first driving pulley or sprocket and said first driven pulley or sprocket, said first axis of rotation being vertically above said second axis of rotation relative to said workpiece support surface;
- and
- a second drive train comprising:
- a second driving sprocket fixedly connected to said driven pulley at the offset position in such a way that the first drive train drives the second driving sprocket;
- a second driven sprocket fixedly coupled to said drive input and configured such that rotation of said second driving sprocket rotates said drive input;
- and
- a second chain engaging said second driving sprocket and said second driven sprocket and configured such that rotation of said second driving sprocket rotates said second driven sprocket,
- wherein said cutting element defines a cutting plane, and said drive assembly is arranged entirely on a first side of said cutting plane,
- wherein said cutting plane intersects said motor such that a first portion of said motor is arranged on the first side of the cutting plane, and a second portion of said motor is arranged on a second side of the cutting plane, said first portion having a first length measured parallel to the first axis of rotation and said second portion having a second length measured parallel to the first axis of rotation, and the second length is greater than the first length,
- wherein said drive assembly further comprises a drive housing that defines a first end side of the drive assembly, the drive assembly having a second opposite end side, said first and second drive trains being entirely positioned between said first and second end sides;
- and
- wherein a distance between said first and second end sides measured along a direction parallel to said workpiece support surface and parallel to said first axis of rotation is less than a third of an overall length of said motor measured along said direction, wherein said second drive train includes a tensioning mechanism engaging said second chain between said second driving sprocket and said second driven sprocket.
17 more elements
Dependencies are inferred from the claim text.