초록 ▼

The improved battery-powered lawnmower includes a safety key that is automatically removed when the removable battery is removed, while at the same time blocking the battery recharger receptacle. The lawnmower also includes a control circuit that shuts off the lawnmower upon the occurrence of one or

The improved battery-powered lawnmower includes a safety key that is automatically removed when the removable battery is removed, while at the same time blocking the battery recharger receptacle. The lawnmower also includes a control circuit that shuts off the lawnmower upon the occurrence of one or more of several predetermined conditions, including low battery voltage, the encountering of heavy grass for a period of 3 seconds or more, and high motor current that may occur when the cutting blade is jammed. The cutting blade is designed to move through any debris accumulated between the blade ends and the housing sidewall without sacrificing the lift for needed cutting and mulching. The invention also includes a unique height adjustment assembly for adjusting the height of the chassis, a handle attachment that allows the handle to be positively tightened to the lawnmower chassis, and a telescoping groove for the battery\s quick connect/disconnect terminals.

대표청구항 ▼

A battery-powered lawnmower having a chassis, comprising: a height adjustment apparatus that adjusts the height of said lawnmower chassis, including: a first wheel axle having first and second ends; a first pivot arm, interconnected with said first end of said first axle, and having a first pivot in

A battery-powered lawnmower having a chassis, comprising: a height adjustment apparatus that adjusts the height of said lawnmower chassis, including: a first wheel axle having first and second ends; a first pivot arm, interconnected with said first end of said first axle, and having a first pivot interconnected with said chassis; a second pivot arm, interconnected with said second end of said first axle, having a second pivot interconnected with said chassis; a second wheel axle having first and second ends; a third pivot arm, interconnected with said first end of said second axle, having a third pivot interconnected with said chassis; a fourth pivot arm, interconnected with said second end of said second axle, having a fourth pivot interconnected with said chassis; means for pivoting said first pivot arm about its first pivot; link means for pivoting said third pivot arm about its third pivot in response to the pivoting of said first pivot arm; whereby the pivoting of said first pivot arm by said pivoting means rotates said first wheel axle to thereby pivot said second pivot arm about said second pivot; whereby the pivoting of said first pivot arm by said pivoting means causes said link means to pivot said third pivot arm about its third pivot; whereby the pivoting of said third pivot arm by said link means rotates said second wheel axle to pivot said fourth pivot arm about said fourth pivot, thereby adjusting the height of said lawnmower chassis; a control system, including: a lawnmower handle having a first end interconnected with said lawnmower chassis, and having an opposed second handle end disposed away from said chassis; a deadman control interconnected with said second end of said handle, said deadman control including a movable member that is held by an operator during operation of said lawnmower, and that is released by said operator to stop said lawnmower; means for stopping said lawnmower upon the occurrence of at least one predetermined condition; means for restarting said lawnmower after said lawnmower has been stopped by said stopping means, by releasing said movable member and by thereafter moving said movable member; a safety device, including: a removable battery; at least one electrical connector interconnected with said chassis; a removable key, including at least one electrically conductive member that engages said electrical connector to allow said lawnmower to operate; an engagement member that causes said battery and said key to engage each other, whereby the removal of said battery also disengages said electrically conductive member from said electrical conductor; a handle attachment assembly, including: at least one channel affixed to said lawnmower chassis, including: a first sidewall; a second sidewall that is non-parallel to said first sidewall; said first end of said lawnmower handle being received in said channel, wherein the shape of an outer surface of said handle first end corresponds to the shape of said channel; and means for attaching said handle first end to said chassis; a cutting blade having a longitudinal axis, comprising: a lead cutting edge disposed near an end of said blade; a trailing lift edge disposed opposite to at least a portion of said cutting edge; an outer blade edge at the end of said blade between said cutting edge and said lift edge; wherein a portion of the outer blade edge between the cutting edge and the blade longitudinal axis forms an included angle with said longitudinal axis taken across said blade that is greater than 90°, and wherein said outer blade edge is non-linear; apparatus for mounting said removable battery, comprising: at least one projection extending from a side surface of said battery; at least one groove formed in said lawnmower chassis and having a longitudinal axis that receives said projection, said groove including a first tapered section having a first set of sidewalls, at least one of said sidewalls forming a first angle with said longitudinal axis; and a second tapered section adjacent to said first tapered section having a second set of sidewalls, at least one of said second sidewalls forming a second angle with said longitudinal axis.