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US 6,269,543 B1Granted
Portable saws having chip scattering prevention devices
AssigneeMakita Corporation
InventorKatumi Ohkouchi
Life of this patent
Estimating the term…
Abstract
A portable saw includes a saw unit that has a motor and a saw blade. The motor rotatably drives the saw blade. A base is adapted to rest on a workpiece to be cut. The saw unit is vertically movable relative to the base to vary a cutting depth into the workpiece. A cover prevents cutting chips from scattering to the surrounding area and is pivotable about a pivotal axis that is the same as the rotational axis of the saw blade. A control device controls the pivotal position of the cover in response to the vertical position of the saw unit relative to the base.
Claims18
A portable saw comprising:
- a saw unit having a motor and a saw blade rotatably driven by said motor;
- a base, wherein the saw unit is adapted to pivot vertically relative to the base to vary a cutting depth of said saw blade into a workpiece;
- a chip cover adapted to prevent cutting chips from scattering to the surrounding area, wherein the chip cover is further adapted to pivot about the pivotal axis of said saw blade in order to maintain substantially the same relationship with the saw blade when the saw blade is vertically pivoted relative to the base;
- and
- a control device for controlling the pivotal position of said chip cover in response to the vertical position of said saw unit relative to said base, wherein the chip cover does not pivot during a cutting operation.
2 more elements
A portable saw comprising:
- a saw unit having a motor and a saw blade rotatably driven by said motor;
- a base, wherein the saw unit can be pivoted vertically relative to said base to vary a cutting depth of said saw blade into a workpiece;
- a chip cover adapted to prevent cutting chips from scattering to the surrounding area that can pivot about a pivotal axis that is substantially the same as the rotational axis of said saw blade;
- and
- a control device for controlling the pivotal position of said chip cover in response to the vertical position of said saw unit relative to said base, wherein said control device comprises a cam mechanism that is disposed between said cover and said base, and
- wherein said cam mechanism includes a cam pin disposed on the cover and a cam recess disposed on the base.
3 more elements
A portable saw comprising:
- a saw unit having a motor and a saw blade rotatably driven by said motor;
- a base, wherein the saw unit can be pivoted vertically relative to said base to vary a cutting depth of said saw blade into a workpiece;
- a chip cover adapted to prevent cutting chips from scattering to the surrounding area that can pivot about a pivotal axis that is substantially the same as the rotational axis of said saw blade;
- and
- a control device for controlling the pivotal position of said chip cover in response to the vertical position of said saw unit relative to said bases
- wherein said cover has a cover portion that is spaced from an outer peripheral portion of said saw blade by a predetermined distance and that extends substantially along an arc about said pivotal axis, said cover portion has one end opposite to said base in the circumferential direction, and wherein said control device is operable to maintain said one end of said cover portion substantially in a fixed position relative to said base, regardless of changes in vertical position of said saw unit relative to said base, said control device comprises a cam mechanism that is disposed between said cover and said base, said cam mechanism includes a cam pin disposed on said cover and a cam recess disposed on said base, said cam pin is integrally formed with said cover and said cam recess is formed in a cam plate that is secured to said base and said saw unit further includes a spindle and a bearing for rotatably supporting said spindle, said spindle being adapted to be rotatable driven by said motor and having said saw blade mounted thereon, and said cover being rotatable mounted on an outer periphery of said bearing.
3 more elements
A saw comprising:
- a motor,
- a saw blade driven by the motor, the saw blade having a rotational axis,
- a blade guard that pivots about a pivotal axis that is substantially the same as the rotational axis of the saw blade during a cutting operation,
- a base,
- means for coupling the saw blade to the base, wherein the saw blade is arranged and constructed to pivot vertically relative to the base to vary the saw blade cutting depth,
- a chip cover that pivots about a pivotal axis that is substantially the same as the rotational axis of the saw blade, and
- means for controlling the pivotal position of the chip cover in response to vertical movement of the saw blade relative to said base.
4 more elements
A saw comprising:
- a motor;
- a saw blade driven by said motor;
- a base;
- means for coupling said saw unit to said base, whereby said saw blade can pivot vertically relative to said base to vary the saw blade cutting death;
- a chip cover coupled to said saw blade and that pivots about a pivotal axis that is substantially the same as the rotational axis of said saw blade, and
- means for controlling the pivotal position of said chip cover in response to vertical movement of said saw blade relative to said base;
- wherein said control means maintains said chip cover in a fixed position relative to said base as said saw blade pivots vertically with respect to said base.
4 more elements
A saw comprising:
- a motor,
- a saw blade driven by the motor,
- a base,
- a pivotal coupling connecting the saw blade and motor to the base, wherein the saw blade is adapted to pivot vertically relative to the base,
- a chip cover disposed around the saw blade, and covering a portion of the saw blade that is less than a 45 degree sector of the saw blade and
- means for fixing the chip cover in a position relative to the base during vertical movement of the saw blade relative to the base, the fixing means pivoting about a pivotal axis that is substantially the same as the rotational axis of the saw blade.
3 more elements
Dependencies are inferred from the claim text.