Two-handle arrangement for a handheld portable tool
AssigneeAndreas Stihl AG & Co. KG
InventorsJochen Kramer, Hans-Peter Dohse
Life of this patent
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Abstract
The invention relates to a two-handle arrangement for a handheld portable tool having a drive motor and equipped with forward and rearward handles for two-handed operation. Each of these handles includes respective actuating elements which can be actuated only in a specific sequence. First, force must be applied to the actuating element on the forward handle and only when a corresponding actuation of the throttle lever takes place is there an increase in the speed of the drive motor. The invention is especially suited for handheld portable tools equipped with an internal combustion engine such as motor-driven chain saws, hedge trimmers and the like.
Claims21
A two-handle arrangement for a handheld portable tool having a motor housing for accommodating a motor therein for driving a work tool, the motor being controlled via a throttle pull line and the two-handle arrangement being provided to permit two-handed operation of the tool by an operator, the two-handle arrangement comprising:
- a forward handle connected to the housing;
- a rearward handle connected to the housing rearward of said forward handle;
- actuator means for actuating the drive motor of the portable tool, said actuator means being mounted in said rearward handle so as to be movable between a start position corresponding to a standstill condition of the work tool and an operating condition wherein the drive motor drives the work tool;
- throttle redirect means for actuating the throttle pull line for acting on the motor;
- coupling detent means interposed between said throttle redirect means and said actuator means, said coupling detent means being movable between a coupling position wherein said actuator means is coupled to said throttle redirect means and a decoupling position wherein said actuator means is decoupled from said throttle redirect means;
- enabling means operatively connected to said coupling detent means and being mounted in said forward handle so as to be movable from a rest position corresponding to said decoupling position into an active position for moving said decoupling detent means into said coupling position;
- said coupling detent means and said throttle redirect means conjointly defining interface means for permitting a force-transmitting connection to be established between said actuator means and said throttle redirect means via said interface means only when said coupling detent means is in said coupling position and said actuator means in in said start position;
- said actuator means including:
- a pivot pin mounted in said handle and defining a pivot axis;
- a throttle lever pivotally mounted in said rearward handle on said pivot pin;
- and, resilient biasing means for resiliently biasing said throttle lever into said start position;
- said throttle redirect means being a redirect lever pivotally mounted on said pivot pin so as to be pivotally movable relative to said throttle lever;
- said redirect lever being a two-arm lever having first and second lever arms;
- and, said throttle lever pull line being connected to said first lever arm of said redirect lever;
- and,
- said second lever arm and said coupling detent means conjointly defining said interface means.
A two-handle arrangement for a handheld portable tool having a motor housing for accommodating a motor therein for driving a work tool, the motor being controlled via a throttle pull line and the two-handle arrangement being provided to permit two-handed operation of the tool by an operator, the two-handle arrangement comprising:
- a forward handle connected to the housing;
- a rearward handle connected to the housing rearward of said forward handle;
- actuator means for actuating the drive motor of the portable tool, said actuator means being mounted in said rearward handle so as to be movable between a start position corresponding to a standstill condition of the work tool and an operating condition wherein the drive motor drives the work tool;
- throttle redirect means connected directly to the throttle pull line for acting on the motor;
- coupling detent means interposed between said throttle redirect means and said actuator means, said coupling detent means being movable between a coupling position wherein said actuator means is coupled to said throttle redirect means and a decoupling position wherein said actuator means is decoupled from said throttle redirect means;
- enabling means connected to said coupling detent means and being mounted in said forward handle so as to be movable from a rest position corresponding to said decoupling position into an active position for moving said decoupling detent means into said coupling position;
- and,
- said coupling detent means and said throttle redirect means conjointly defining interface means for permitting a force-transmitting connection to be established between said actuator means and said throttle redirect means via said interface means only when said coupling detent means is in said coupling position and said actuator means in in said start position.
Dependencies are inferred from the claim text.