Cordless circular saw
First Claim
Patent Images
1. A circular saw comprising:
- a motor housing having a first end portion and a second end portion, the outer end of said second end portion having a recess configured to receive a removable battery pack in locking engagement, including a deeper portion of said recess for receiving a stem portion of a battery pack;
a motor assembly disposed within said housing;
a rotary blade assembly including a circular blade with an axis of rotation, said assembly having a first predetermined weight and being disposed at said first end portion of said motor housing, said first predetermined weight multiplied by the distance from said assembly to a vertically oriented first gripping portion of a handle assembly defining a first moment arm;
a battery pack having a protruding stem portion and a second predetermined weight, said stem portion being inserted in said deeper portion of said recess when said battery pack is placed in said recess of said second end portion of said housing, said battery pack, said motor assembly and said rotary blade assembly being configured and arranged to be in longitudinal alignment with one another along said axis of rotation, said second predetermined weight multiplied by the distance from said battery pack to a vertically oriented first gripping portion of a handle assembly defining a second moment arm;
said handle assembly extending from said motor housing, said handle assembly having a vertically oriented first gripping portion that is configured to be generally perpendicular to said axis of rotation, said first portion being generally centered between said first and second housing end portions along said axis of rotation, andsaid housing having a predetermined length along said axis of rotation, and said first moment arm is substantially equal to said second moment arm.
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Accused Products
Abstract
A circular saw including a motor housing having a first end portion and a second end portion, a motor assembly disposed within the housing, a rotary blade assembly having a predetermined weight mounted to the first end portion of the motor housing, and a battery pack having a predetermined weight disposed on the second end portion of the motor housing. The battery pack and the rotary blade assembly are configured and arranged to be in longitudinal alignment with one another, and the longitudinal alignment of the battery pack with the rotary blade assembly promotes counterbalancing between the predetermined weight of the rotary blade assembly and the predetermined weight of the motor housing.
45 Citations
10 Claims
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1. A circular saw comprising:
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a motor housing having a first end portion and a second end portion, the outer end of said second end portion having a recess configured to receive a removable battery pack in locking engagement, including a deeper portion of said recess for receiving a stem portion of a battery pack; a motor assembly disposed within said housing; a rotary blade assembly including a circular blade with an axis of rotation, said assembly having a first predetermined weight and being disposed at said first end portion of said motor housing, said first predetermined weight multiplied by the distance from said assembly to a vertically oriented first gripping portion of a handle assembly defining a first moment arm; a battery pack having a protruding stem portion and a second predetermined weight, said stem portion being inserted in said deeper portion of said recess when said battery pack is placed in said recess of said second end portion of said housing, said battery pack, said motor assembly and said rotary blade assembly being configured and arranged to be in longitudinal alignment with one another along said axis of rotation, said second predetermined weight multiplied by the distance from said battery pack to a vertically oriented first gripping portion of a handle assembly defining a second moment arm; said handle assembly extending from said motor housing, said handle assembly having a vertically oriented first gripping portion that is configured to be generally perpendicular to said axis of rotation, said first portion being generally centered between said first and second housing end portions along said axis of rotation, and said housing having a predetermined length along said axis of rotation, and said first moment arm is substantially equal to said second moment arm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A circular saw comprising:
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a motor housing having a first end portion and a second end portion, the outer end of said second end portion having a recess configured to receive a removable battery pack in locking engagement, including a deeper portion of said recess for receiving a stem portion of a battery pack; a motor assembly disposed within said housing; a rotary blade assembly including a circular blade with an axis of rotation, said assembly having a first predetermined weight and being disposed at said first end portion of said motor housing; a battery pack having a protruding stem portion and a second predetermined weight, said stem portion being inserted in said deeper portion of said recess when said battery pack is placed in said recess of said second end portion of said housing, said battery pack, said motor assembly and said rotary blade assembly being configured and arranged to be in longitudinal alignment with one another along said axis of rotation; a handle assembly extending from said motor housing, said handle assembly having a vertically oriented first gripping portion that is configured to be generally perpendicular to said axis of rotation, said first portion being generally centered between said first and second housing end portions along said axis of rotation; said handle assembly having a second handle having a horizontal portion generally parallel to said axis of rotation and attached to said housing spaced forwardly and above said housing to enable a user to grip said horizontal portion, said horizontal portion extending toward said housing second end portion to a position generally coextensive with said outer surface of said housing second end portion, said horizontal portion merging with a transverse portion that is unitary with said horizontal portion, said transverse portion extending rearwardly and downwardly and being generally parallel to said first gripping portion, said transverse portion being generally perpendicular to said horizontal portion, said transverse portion terminating slightly above and coextensive with said battery pack.
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Specification